Is this really a flex though? More importantly, how many away matches has he missed that protects that average of his?
If that happens less going forward, then possibly, but he's one player that can't be properly rated at this point purely by his numbers.
He missed way fewer away matches than Jim Laker. And I hope you don't really believe he sits out on away matches to protect his average; not because Jadeja is a much better batsman away (not to mention fielder) and India has good pace line-up so in most conditions they opt for a single spinner; right? So let's dissect other spinners record a bit.
Jim Laker only played 4 matches in Australia and that's not because Tony Lock was an excellent batsman, but particularly because off his first series in WI, the selectors maintained the universal opinion that he won't be much useful out of slow English wickets. He played one series in Australia at his peak (and basically has the same average as Jadeja there in same no. of matches), and wasn't penetrative in SA and WI, maintaining meddling figures against not so strong batting line-ups. Throughout his whole career, he didn't played in around half the matches England played.
Hugh Tayfield averages 34+ overall against Australia. He doesn't really boosts an impressive longevity, and so basically against the 2 teams he played against; he was successful against one and wasn't against the other overall same no. of matches.
Hedily Verity averages 34+ in Australia, the only solid team he played against; as well as almost 30 against a pretty mid SA away. He was as much of a home bully as anyone.
Clarrie Grimmett averages 32+ against literally the only respectable team he played against. His averages are hugely pumped against minnows of WI and SA.
Lance Gibbs almost averages 30 in his home. He also is not really successful in Australia.
Derek Underwood got thrashed by WI, home and away. He also isn't really great in Australia and Pakistan.
Anil Kumble averages 35+ overall away, 40+ in 4 countries. Ashwin 30+, 40+ only in Australia (where he actually helped India to win 2 series) and SA. Under 30 everywhere else (England, Sri Lanka, basically these 2).