This is what I found.

We still don’t know who told him it would not work. I think it was “they”.

 

The following description on the seller’s website says it all. Bolding mine:

[Power up to 1200W] - RIVER 3 Plus portable power station delivers a steady 600W and surges to 1200W

There is no definition of the surge’s length. It could be a millisecond for that matter.

Here is the answer. It is only 600W device and wil power things up to this value. Ignore the rest of the sales talk.

 

This is what I found.

We still don’t know who told him it would not work. I think it was “they”.

Perhaps it was a him or maybe a her. Definitely it wasn’t me, you or us.