is it anything more than a private opinion? Does he have any proofs?

Pamiętam, jak jeszcze przeglądałem commity na cia.vc. to były czasy

File is probably compressed, just like EmuandCo has mentioned (Word *.docx files are archives too), or file is in format where you will achieve little to no compression, like *.mp4 files

Seriously? I think, that you are overracting. It is really not good for ReactOS reputation in free software, attacking other project, where neither logo or name do not trick users to think those two projects are related.

It doesn't work

Take a look at day 4:

http://www.qemu-advent-calendar.org/2016/

Polskie forum reactosa już dawno jest martwe. Nawet moderatorzy tu nie zaglądają

Maybe something like this:

P.s. Hello, Reactos Community.