Hmm. I'm not saying your wrong, but it's hard to believe. Latency aside, I couldn't imagine the mic quality being as good through the dongle as it is with the limited bandwidth BT has. Even with high end codecs, it's still not that good. They do have LC3PLUS codec, but you don't need the dongle to use that and the mic quality is not the same.
I just double checked the product page and they only mention 2.4Ghz twice and it's to say it's 3x better than the one in the Penrose. The Penrose 2.4Ghz was objectively trash. Even my A50s had 3x the range and connection stability and it used the same type of connection, just better.