Anyone heard of the "A4 Fully symmetrical double differential" amplifier ?

[anorphirith]

I was looking for diy susy amps and stumbled upon that

I couldn't find any infos on the designer or any reviews

they just call it the" A4"



A4 Fully symmetrical double differential High-power power amplifier DIY Kit 300W | eBay


A4 Fully symmetrical dual differential amplifier board 2.0 High power power amplifier board 300W+300W| | - AliExpress