They should update their license page.
License: 3-clause BSD license - free for open source and commercial software
or GPL.
with the exception of aggpas/gpc/gpc.pas which has a "not free for commercial use",
and is not used/compiled by default.
is not visible there. anyway, few exceptions and it is not even compiled by default.
The license page does not mention 3-clause bsd, but it is 3-clause bsd conformant: free, but the copyright should be mentioned in both binary or adapted sourcecode distributions.