The white pistils are a sign of bud growth, often confused for harvest ready. It’s entirely possible for the plant to be done producing pistils before the trichs are ready. In this case, because it’s dying due to the break. It could very well still be packing weight if it had not broken. Or, you could be entirely correct and it could’ve been done anyway.
Either way, monitoring pistils can be useful. It’s just more of bud swell thing than determining harvest time. It’s common for it to still take time for trichs while done swelling, or still be producing new pistils when trichs are going amber.