Depends what you mean by youth, guys like White, Gabriel, Ramsdale, Tierney are in their mid 20s, which for a footballer isn't really youth. And he actively bought White because Saliba was too young.
The only really young players in the team are ESR and Saka, and that's because they are extraordinary talents and our top scorers.
And now with Elneny getting a new contract and Xhaka staying that's another example of him preferring experience over a kid like Lokongo, who was a big investment.
I really don't see Arteta as someone who is going to give youth a chance, and by that I mean someone from the reserves / u21s