I have some experience with bearing replacements in the Tormach and have to say while the recording sounds pretty clear, I never encountered the type of sound that yours appears to have with something like a lobe or "high point" hitting something. Mine was simply an overall change in the otherwise "smooth sounding" that was most normal. Some people will laugh at the approach, but if you use the old mechanics trick of putting a flat tipped screwdriver on the column in different locations and the smooth or hopefully "rounded end" in your ear - you can better pinpoint the area where the sounds seem to be coming from. There are two sets of bearings and you may have more issues with the "upper" or the "lower" set - no way to really know too much better. This isn't as simple as just putting grease where it's dry and Tormach has a pretty specific approach to the use of grease in and around the bearings - which I agree with. Having 1 ounce do some good doesn't mean that 16 ounces does anything better! It's all about having it where you need it and then "protecting" it to make it last longer. Read their literature about replacing the bearings and look at the variety of Utube stuff also related to this subject.
I see your location is in the garage - mine was also but suffered a bit more in the winter months because of not having consistent heat. If you want the bearings to last longer, then you can't expect to walk in "cold" - turn on the spindle and start working like mad! You'll do well to use something of a "warm up routine" IF your garage temperatures are on the colder side. I start the spindle (in reverse) and run it at a low rpm (500-1000) for about 5 to 10 minutes, then stop, reverse the direction and put another 5 to 10 minutes on it. That at least gives the internal components a chance to start warming up and if your garage is on the cold side, then the grease within the bearings "settled" and cooled off in whatever levels existed when you ran the spindle previously. The amount of grease is actually pretty slim and you're not going to move it around much, you're just wanting to get it to "circulate and lubricate" as much as can possibly happen when it's retained in a specific area.
Doing the homework up front before you take on the removal of the spindle and bearings is well worth the effort and time. It will all make far more sense once you've gone thru it and when you get into the re-install portion of the work, the re-tightening of the spanner nuts is a key item to pay attention to. The same theory applies - the right torque makes things work as intended, excessive doesn't make anything work better! My vote would probably be a problem with the bearings as there's little else within the column that moves in a way that might make that sound, unless something very small and hard has dropped in or around the inside of the drawbar area but I would think that would be easy as well to chase down if you just pulled the drawbar out and ran the spindle. Good luck, get your digital camera ready along with the new bearings and follow the Tormach instructions and notes! They're established for a good reason, and good luck. Let us know what it turns out to be. Thanks.