Fyliu you may be right but the poor translation of the jason nursery site overwhelmes clarity on this and people are calling it A4.To me it appeared that seedless came in 2 forms each with different average weights and flavor descriptions ie seedless and A4 seedless.
I think it's fine to use the name to distinguish it from other seedless ones. His English has improves a lot over the last year from westerners pestering him about yumberries and lychee.
He wants to sell more kinds of fruits but he doesn't know what might become popular. What other Chinese fruits are good and not exported yet? I only know of citrus, Chinese gooseberry, loquat, wampe, peach, pear, longan, lychee, yumberry. Most are too common that it's not worth buying from afar.