Paul Pogba is 32 years old. Arab clubs could have been a better option for him. I don't know how many more years he will play football. Although it varies greatly, on average, 34-35 years old is a good age to retire from football. He could have spent his retirement years earning a lot of money at Arab clubs. By staying in Europe, he has embarked on a new challenge. I think he wants to prove himself...
Yeah Pogba is also a Muslim, which mean he has no problem to play in Saudi Arabia.
Pogba will not able to prove anything, he played in mediocre team and even he get his performance back, he's already old and no top teams will interested to sign him. Imagine Pogba playing in Al Nassr, he will able to support Ronaldo to score many goals with his beautiful pass.
Pogba hasn't played for a couple of years and that's a huge problem because the Saudi league has gotten much stronger in recent years and yesterday Al Ahli and Inter Miami played and it was obvious how much stronger the Saudi league team is than the MLS team, although Inter Miami have Messi, Suarez and Busquets who are younger than Ronaldo but play at speeds much lower than even the average Saudi league teams.
So it is still unclear whether Pogba will be able to play in the Saudi league, after such a break that he has and as you correctly pointed out he has 2-3 years left, when he can still theoretically show a high enough level of soccer, until he is 35-36 years old.