Usually, by applying the NBT Tag HideFlags you can hide modifiers, attributes, etc.
But the ItemStack mixin that modifies getTooltip for trinkets does not seem to take the HideFlags tag into account.

Either that or I'm experiencing some other issues since the tag does not seem to hide the attribute modifiers.
NOTE: Does work with other tags (tested with Damage)

Version: 3.0.4 (1.17.1)