Level and tier aren't related, thus level 89 mainly shows an industrious player (or multiple level boosts below level 65).
79 average and Pro fit together. There may be some players around where this is honestly justified.
20 under Par (18 holes) is either a brilliant 52 on any regular course or a super-good 70 on the Par5 course. Difference is, the latter doesn't count towards the average.
The latter points to a player who hides his skills => probably sandbagger!