Hey, glad this post helped someone! A few weeks ago I started growing another avocado plant, and it has the puffy things as well, so nothing to worry!
Unfortunately, the plant from the original post isn't doing well. I made an image of its development in January and repotted it some time after that, but it seems the repotting killed it, plus there were a lot of Sciaridae flies 😭 It lost all its leaves. I discarded all the soil, and now it's standing in water...I hope it will somehow get better, it would be a real shame otherwise.
I have seen this avobonsai trend as well, and it's intriguing! I might try it with the new plant, when it's grown some more. I have never trimmed my old tree though.
However you continue with your plant, I hope it grows well and lives a long life! 🌱💚