Rob gurgled happily, sounding much like they were saying:
There's a bit more to it than that.
The receivers would take responsibility for all the assets of the business immediately upon the firm going under. They have a legal duty to those to whom the business owes money to generate the maximum return - which includes minimising their own fees as well as maximising the sale value of the assets.
Clearly, they have to secure the site - for all they know, at that stage, there's valuable stuff hidden which could easily go awol.
But not only would scrap value for that stuff be relatively high, but a single clearance will be low-hassle and low-admin-cost.