My hunch is the periodic scrapping rumours came from someone who heard will no longer be working a specific route.
I tend to look at this in context. TPE probably have too much stock, although with some 3car trains that really need to be longer and regular cancellations they might actually have correct amount, but just not utilising it.
So I tend to wonder if something is moving to another operator.
LNER were looking in 2019 for about 10-15 trains (that went on hold during pandemic, so would they take 802s ?). GWR are desperately short in South West, but they could probably use the mk5s to replace the old castle HST workings, so their IET fleet is not overstretched.
Lets be honest if a piece of metal is deemed weak and prone to cracking, normal solution is to bolt a strengthening plate to it, (or weld one on, although that isn't always easy if delicate electronic equipment needs to be removed), not to scrap the whole vehicle.