They must be fairly new. The umol/j seems good if its genuine.
The issue I would have for not believing them is the fact they say stupid things like "designed to replace 2000w of HPS"
Problem with lying like that is it throws everything else into dispute.
I don't know enough about those LEDs, though ive heard of them I couldn't say if they genuinely are that efficient as that 2.7umol/j claim.
You could for less than that price get 2 hlg v1 boards at $29 a piece and a twin heatsink and either HLG driver or XLG driver and have a 240-280w light though. Depends on if your in US I suppose.
Of course this light has additional spectrums though.