Exactly. No proof on my end, just too many "coincidences" with regards to the size of the cells and the rated cycles at 1C etc. Identifing the IP holder would resolve quite a bit.
If you're talking about me, I'm just buying on the market ATM. If I felt I could move the quantities that one of these manufacturers would be interested in, I would go straight to the source. For example, I'm currently talking with DEYE directly about buying inverters. Apparently they have sizes (up to 12KW split-phase, same as SOL-ARK) that the none of wholesalers I have spoken with offer or carry. I have a suspicion it's a company policy at Deye but I could be wrong.