I don't know whether Bob's trolling, but I'm pretty sure you are.

[EDITED to add: I see someone downvoted you; it wasn't me.]

What is the probability of someone not reading the post and posting a comment which happens to use exactly the same cca 2500 characters as this?

Assuming at least 4 bits per character, the probability is at most 2^10000. Quite unlikely, if you ask me.

I hope I have addressed your concerns sufficiently.