Is there a way I can record the rides I do on a Tacx Flow T1682 turbo?
Garmin's website (here) leads me to believe it should work through bluetooth or ANT+.

Garmin are referring to fully smart trainers, unfortunately the trainer you have is only semi smart.
Although your trainer will be able to send speed and power to apps like Zwift it is limited so power will not be that accurate, IIRC Zwift have non smart (or wheel on trainers) set at a limit of 3 to give a rough power guide.
Garmin 520 units will also only connect directly with a fully smart trainer.
Unfortunately you wont be able to directly link your trainer with your Garmin 520 but you do have some options.
Use a 3rd party app like Zwift, Rouvy, RGT, BKOOL (others do exist but these are the most popular) - You may find BKOOL the better option if you have saved routes you wanted to ride, you can upload them and ride them through the BKOOL app.
Any of the above apps have the ability to send recorded activities straight to Strava after you have finished the ride, if you have your Garmin Connect account linked to Strava you should see the finished ride available in both Strava and Garmin.
All the above is based on the fact you have access to a PC or Laptop, BKOOL and Zwift can be used with a smartphone or tablet.