Wielerflits has become absolutely terrible the last couple of years, just pure clickbait, but it's not necessarily pro-Dutch or anti-Belgian clickbait. They just know anything Visma (preferably negative) and anything Evenepoel (also preferably negative) will generate clicks.
As for my stance, it's always been pretty much the same, and I'll give you one example: Van der Poel has spent a couple of Tours pretty much as a leadout man for Philipsen, and not much else. Do the Dutch media care about that? No, not really. I can't imagine something similar with Van Aert, and the Belgian media not turning it into a giant issue. Personally I think this is part of the reason Van der Poel has a much more impressive palmares than Van Aert: a relatively relaxed atmosphere vs. total media and fan obsession. That's the thing: it doesn't even benefit your riders, quite the contrary actually.
Maybe one of the really appealing things about Uijtdebroeks is that this obsession seems largely nonexistent in his case. It doesn't seem to have helped him though, so far
In the case of Van der Poel, that is very different for a few reasons. First of all a lot of people (both sides of the border) consider him a Belgian as much as a Dutchman. Born here, raised here, lives here, works here, talks Flemish, races in a Flemish team, has a Belgian wife/girlfriend, doesn't have the usual Dutch attitude... He only has a Dutch passport. He is Dutch on paper only.
Secondly, Van der Poel is the undisputed leader in his team, him doing a leadout for Philipsen doesn't prevent him from doing anything he wants to do or chase his own ambitions. If that is all he did during the TDF, that means there simply weren't any opportunities for him (or not for his form at the time). That's completely different to Van Aert who has spent years making the TDF his main focus of the year in order to work his ass off for the team in July. For him it is the opposite, he has to be grateful every time he is allowed to go in a break or sprint for a win. He was a huge factor in Visma winning the TDF twice, he does leadouts for teammates when he knows they can win even if he could win them as well. Van Aert has forfeited many more personal ambitions for the team(mates) than Van der Poel. He is also a much more versatile road racer than Van der Poel. He was 2nd in Tirreno GC behind Pogacar, he has major ITT wins and medals, he was a huge mountain domestique and a personal bodyguard on flat/cobble/echelon stages for both Roglic and Vingegaard. The level of sacrifice for his team compared to Van der Poel is on a completely different level. So when a teammate could pay something back, this is a far more delicate situation compared to Van der Poel at Alpecin.
The entire Roglic thing was also hugely overblown. First of all, and even when i don't like it, national races simply are raced over brand teams. You saw Del Toro pull for Pogacar, you saw Sivakov pull for Pogacar, we all know it, it has happened since the dawn of cycling. Nys didn't want to chase Groenendaal etc. So when Roglic is in a situation he can no longer win for himself or his country, expecting him to pay back a rider who has turned himself inside out many times for him, is given that context not really that strange. So unless you were outraged by Sivakov, Del Toro, Nys... then you really have no moral highground here.
And again, still, Belgian media focusses on cycling a lot more than any other country. There are basically only 10 million of us, yet every news paper has a major section dedicated to the sport. In the Netherlands there is only Wielerflits, you need a magnifying glass to find any relevant cycling info on NOS Sport for instance.