PS4 can't be cleaned because screws are missing behind?

Have a PS4 about the years 2014/15 was purchased. Now, after four years of use, it wanted to get rid of the dust, which probably accumulated massively in the following years. Now, however, I had to strangely find out that there are no screws to screw it on at the back.

How exactly should I proceed now and maybe it may be that my model is perhaps a little older without screws?

Here iFixit breaks down the PS4:

https://de.ifixit.com/...down/19493

Just follow the appropriate steps