On why he isn't playing? It's a whole list of things but it can be boiled down to the idea that developing youth players simply isn't a priority either for Pep or for the club, despite Khaldoon's constant lip service. The squad is bloated as a result of choosing to participate in every trophy. This isn't necessarily a bad thing, but the reality. When other clubs have injuries they often turn to youth, we turn to other internationals. Combine that with how hierarchical Pep is in his squad selection, where seniority clearly matters to him, and you get very few opportunities for ANY young player to play, not just Phil.
Look an Ansu Fati at Barca, a few injuries and all of a sudden he's starting games. Meanwhile we had no one to come in a give Raz a break so instead of giving some minutes to say, Jayden Braaf, we shift Angelino up to play winger in cup games, because hey we bought this guy and he needs to play some time.