Man, that’s cool! Concrete is a heck of a lot cheaper than epoxy granite resin and is perfectly suitable for a low-precision tool like this lathe.
I do hope that he finds a way to shield those bearings. You really don’t want metal chips or sawdust making its way in there. Any damage they sustain will cause runout, which will lead to increased chatter and parts that are out of spec. Plus, a matching pair of tapered roller bearings can be quite expensive!
EDIT: to be clear, I mean no disrespect when I say low-precision. Not every lathe needs to have slides and handwheels. I have a little Sherline lathe that I’ve used like this in the past (using gravers, not tools in a tool holder). It’s great to quickly turn something or to put nice decorative details on a part. Precision is possible with a lathe like this, but it requires fairly strenuous effort.
I’ll throw in “folks” as another gender neutral option. I say “you folks” all the time, especially in professional contexts. I’m not from the South, but I have family there so y’all is a part of my vocabulary. I use it in more informal situations pretty commonly.