Don't they build these Macs just-in-time? The bandwidth doesn't change with the RAM, so surely it couldn't have been that hard to just... use higher capacity RAM modules?
"No chance?" But it has been reported that the next generation of Apple Silicon started production a few weeks ago. Those deliveries may enable Apple to release its remaining M3 Ultra SKUs for sale to the public (because it has something Better for its internal PCC build-out).
It also may point to other devices ᯅ depending upon such new Apple Silicon arriving sooner, rather than later. (Hey, I should start a YouTube channel or religion or something. /s)
Which came out in what, mid January? Yeah, there's no chance Apple (or anyone) has built a new chip in the last 45 days.