Believe me, I have read that post/comment quite a few times. There are actually Pi 4 hats for sale for audiophiles (that seem to believe that you need 54000000.000 MHz system clock or whatever it is for Pi4 (Pi3 is 19.2 MHz) for optimal audio) that have an OCXO on them. But in another comment I said I'm not sure my soldering skills are that good.
Adafruit sells a DS3231 module with standard 2.54mm pin headers. I'm using one on a Beaglebone Black that I setup as my NTP/PTP server (using work based on your work from 2021, so thank you!). No soldering required.
I don't have heaps of experience or the steadiest hands, but I'd be comfortable doing a mod like this cleanly now. One good tip is to get your work piece in a position where you can securely rest the blade of your hand on the table or something secure. You want to minimize the leverage and distance between a secure rest point and your work tip.
That should give you 4-5x less drift than his results (though you could pair the techniques for even better figures)