Do you have reading comprehension issues? He doesn't deny it happened in that comment, he calls it a US-backed color revolution and says that the PRC was right to put it down.
Calling the entire protest a color revolution is a matter of opinion, but it is an undeniable fact that many of the most high-profile protest leaders were US-backed.
The claim from """tankies""" is mostly that no massacre happened in the square, but that deaths happened outside of it in clashes between armed protesters and the PLA. Exactly as Dessalines FAQ.