I don't think he played a BAD game, but he did end up sheeping Jeremy a good amount (or at least appearing to, which to a jury, is all that matters), and sheeping is one thing that juries usually can't look past.
Spencer fucked himself by looking like a complete brat at the final 4 tribal from the way he spoke to Wentworth. Also most of the jury stated it wasn't shown but he spoke like shit to people on the show, Tasha did fuck all at the merge and therefore Jeremy was the easy vote. Kinda like how Cochran won his season
Spencer kept saying that he was playing for himself but voted with Jeremy and Tasha every time (except for the Stephen vote) which people didn't respect
Honestly imo kimmi played the best game in Cambodia
And I'm not just saying that cuz I'm like a gay tengager stabbing a hag queen I genuinely believe it and have reasons to back it up
Imo Jeremy got lucky af and just sat there