That is correct. The structural integrity of the platforms is only one aspect.
How would you check/ensure that it is still fit for purpose?
Another aspect I read on this topic and remember from the Brent Spar [1] case is that the cavities and tanks of these platforms are sometimes filled with unknown and/or highly toxic undefined stuff. Unless you 'clean' this up it might not be liveable.
Another aspect I read on this topic and remember from the Brent Spar [1] case is that the cavities and tanks of these platforms are sometimes filled with unknown and/or highly toxic undefined stuff. Unless you 'clean' this up it might not be liveable.
[1] https://en.wikipedia.org/wiki/Brent_Spar