They link all their sources. So regardless of where their funding comes from I’d rather have a good source of information instead of a non-existent perfect source.

“I’m going to watch half the movie then complain about it not making sense and having a bad ending”

My understanding is that the “built by slaves” theory is a bit outdated. The pharaoh had access to a massive population and outside of harvest stations could be engaged in construction efforts. Slaves were very likely part of it too but not the majority of the workforce