Nope, not disk cleanup. The space is gone but there are literally no files on the partition, or in temp folders.
Looks that the PC Health Check App was compiled in 2020 before 21H1 update, says that I'm using Windows 10 20H2. Also got same message that my laptop can't run windows 11 from that app (it's a almost 6 year old laptop with Intel Celeron N2840 processor and no TPM 2.0 support) Edit: even my laptop doesn't has TPM 1.2