HD3 ENOB of 10.4 at 20MHz/-1dB FS is not really spectacular for a 14Bit converter. Maybe they still have too much noise ?
Their claim is they have 2 bits more resolution (factor 4), but they claim to have only "halfed" the noise ... OK, tells something.
When you look at RS MXO4/5 they have similar ENOBs with 12Bit converters.
If I have understood correctly, the Hi-Res mode does not go beyond 16 bit.
As a rule, you get at least 3 bits more in hi-res mode, in some cases even more.
(Siglent SDS3000X HD +4bits).
In contrast, the 14+2 bits of the Keysight Scope seem a little “strange”.
But even that is just speculation, we basically know nothing about it.
This will probably come to an end in 2 weeks.