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The 10 minute thing is not a complete lie IMO. At the start, devoting 10 minutes per day playing (not including the time you are sitting and watching video of Tony playing) will get you going. If you’re a complete beginner, you would want to add time to learn chords and some basic techniques from the skill tab. Just doing this, 10 or 15 min or a bit more can progress you slowly for the first 12 – 18 months. You will be a better player than when you started. But you won’t really make huge strides after that first year or so if you don’t push harder!
Now Tony does say you can also just play 2 or 3 days a week (and only 10 min I assume). That’s really iffy! I can’t see you progressing much with that effort.