I’m not sure why there is any value is removing old work, no matter how old it is, I use coroflot for inspiration and to see what other designers have worked on, could care less if it’s out dated, good design is good design.
As far as finding out who’s “active” if you have a coroflot you have to actively select that you’re looking for work every 30 days or so.
If someone’s able to get job/freelance offers off of 10 year old work then more power to them, means they must have done something right 10 years ago!