Yes I saw this. It's a further worry, along with his comments re ESR and Willian, and ironically had he been referring to the latter in his press conference (he wasn't), then I don't think anyone would disagree - although it is never a good sign when players are being outed by a manager - even obliquely.
What I'm afraid these comments - and the decision making in relation to the team - point to is a narcissistic manager who is not alive to his own faults. It is down to Arteta, not the players, that he has f*cked about with his system and playing positions so much that his players often look like they have no clue what they are doing; who has picked fights with some players and shown blatant favouritsm to others - destroying team unity - and who has rewarded underperformance by continuing to favour certain players over mostly younger players who deserve better.
All managers need a streak of narcissism - but Arteta's seems increasingly off the scale and the real problem is that he is surrounded by yes men who wonlt reign this in. It's a really concerning situation now, going into a Summer that could be a car crash transfer wise...