They still lost Carapaz, Yates, DVB and Porte (not as a rider to bring results, but as a likely big wage) last year. That alone should be enough to cover for the pay rise of the mentioned riders.
Carapaz, Yates, Van Baarle and Porte are 4 riders.
But you have Hayter, Pidcock, Sheffield, Rodriguez, Plapp, Turner, Geoghegan Hart all riders that have made progress and perhaps Ganna can command a bigger contract than a few years ago as well and they've brought Arensman in, who musn't have been cheap after 2022 full of good results.
And while they still have considerable amount ot talent, they don't have any capable of delivering ng TOP results, at least yet.
They don't have anyone as good as Pogacar, Vingegaard or Van Aert, that's why they're going for heaps of young semi-leaders, hoping one of them reaches that level eventually, instead of a more organised approach of a few elite leaders (because no one is available) and experienced domestiques. The former approach means their roster is less sustainable long term and there was always going to be a lot of turnover.
The same was happening to Quick-Step over years, a lot of riders went there and made progress and couldn't fit into the budget anymore after a few years, so they were losing a lot of good riders each year, but still kept performing at the same level as a team because new riders were coming in and developing.
Ineos has a lot of riders who are younger than 25 but already have had some pretty big results. A lot of them are going to improve further in the coming years and fill the void for those who are leaving. That's how it's going for pretty much any team that's relying on young riders and develops them well.