Try this...just as an exercise. Assume they did, even if you don't believe it. Then, see if you can explain your other evidence (diary) another way. If there was no forgery, all the things you see must be harmless, right? Can you honestly tell me there is no harmless explanation for the circumstantial evidence you cite?
That's why you need more than to cast doubt. You're not done. No unbiased, reasonable audience would accept the body of evidence you have presented as proof of fake marks let alone think that this proves Khufu didn't built this pyramid. You are conversing with someone who thinks the Sphinx is older than dynastic Egypt and I'm not on board with this. That should give you pause.