So squeamish uses attack base values without additions to calculate whether murder is going to happen. This makes it so you can still perform murder while squeamish if you are an impaler, or under the effects of demonic possession etc. Like the title says, this may be intended, because without this loophole squeamish is a lot more of a drawback.
It could be consider as working like encumber - before fix, so I'm thinking it should change as well (calculations before effect).
All the triggered cards that refer to damage refer to the base damage values printed on the card, not what they are finally boosted to. Otherwise, we'd have to do multiple rounds of checking (i.e. apply all boosts, then check for more triggers, repeat, etc). So, long story short, it's working as intended.
Didn't you change it so that Flimsy Block et al trigger based on the final boosted amount? If so, do we have multiple systems going concurrently in the game now?