Sadly, this is completely accurate. This is why Adata is not a trustworthy company. They don't publish the read.write times since they are simply horrible. They try to wine and dine you with features and not the actual data.
This might not matter to some people, they will be happy with a cheap pack of storage, but I think it speaks to the commitment of the company to deliver a quality product.
I mean if someone offered you a cheap washer and dryer and then you found out it took like 5 hours to wash and 5 hours to dry... I don't think most people would take it if they had known beforehand lol.