And those were all by one player, Nicole Powell. Ionescu smashed her Pac 12 record during her soph season. Your point that triple doubles are rare stands, but Ionescu is fairly unique in her ability to score, get assists, and rebound.
How about this? How many former UConn stars would've amassed 26 triple doubles if they had played for Graves at Oregon (I know most of them played before he was there, but never mind that)? I would guess none of them.
And what does Ionescu only having one triple double against a top 10 team have to do with anything? NOBODY plays games exclusively against top 10 teams. UConn's conference games during the AAC era...well I don't even need to say it.
edit--I took a quick peak at stats, the vast majority of Ionescu's rebounds were defensive, not offensive, so your point about the PG getting back on D is irrelevant.