I can't believe that I'm actually here defending Remco Evenepoel's GT "stardom", but I stand by my posts.
I'll also say top 4 in this TdF right now on paper has far, far more value than whoever was sitting 2-3-4 back in 2014 when Nibali won. The level is incomparable.
The problem is that "era" is imprecisely defined. If you said "the top 4 GT riders of the present day" then you'd have seen much less blow-back. For me, for something to be an 'era' it has to last through a good few years, so we have, for example, the Sky era. Plus of course riders peak at different times. Primož Roglič is older than riders who very much belong to the 'last' era in terms of their GT contention, such as Fabio Aru, Esteban Chaves, Romain Bardet, Thibaut Pinot, Nairo Quintana, and hell, he's only one month older than Ilnur Zakarin.
If you view the current "era" as anything post-Covid (not unreasonable given the gap in the calendar it created and that it makes a convenient cut-off), then we still have to contest that Jai Hindley (a 1st and a 2nd at the Giro in 2020 and 2022, plus two other top 10s), Egan Bernal (1st and 6th in the Giro and Vuelta in 2021) and Sepp Kuss (1st in the 2023 Vuelta, 8th in the 2021 Vuelta, and 5 other top 20s since 2020) have a stronger GT palmarès than Remco (he has a better record than Tao Geogeghan Hart at least, with his next best being 12th to Tao's 19th), while cases can also be made for riders who had won GTs prior to the pandemic who have since scored podiums and shown they are still challengers - while these bear the hallmarks of being "last year's men", Geraint Thomas has three podiums from the last three seasons, one at the Tour and two at the Giro; Simon Yates has a podium from 2022 and a fourth from 2023. Thomas does feel like a bit of a hanger-on from the 'last' era, for sure, but he's also demonstrably still relevant, he's not like, say, Nairo Quintana, who is nevertheless an active GT winner with five further podiums - just that he hasn't hit the top 3 since 2017.
Definitely having a win pulls him above the likes of, say, Enric Mas, but even so, Mas has two podiums and four top 6s since the pandemic; in many scoring systems he could be argued to be the better Grand Tour rider. But, if you offered every rider in the péloton the choice to have either Mas' GT palmarès or Evenepoel's, I can't think many riders would pick the former.