Haha, Theodore did the same thing with his Bactrim, which was banana flavored I think. Tried to steal the syringe many times. I did what has been suggested – putting the liquid to the side of the mouth where there aren’t any teeth, or putting the liquid in a dish.
As for the pellets, that’s partially right. Good quality pellets such as Oxbow are made with the longevity of rabbits in mind, not for meat rabbits. But yes, many rabbit pellets are terrible and made with alfalfa meal (not good for adult rabbits), molasses, sugar, grains, etc. which is all bad and can lead to diet related issues. Ceasing pellets is also a common way to deal with gastrointestinal problems, but it should be said that good pellets are packed with nutrients that the bun isn’t getting from hay – they should be getting a lot of stuff from veggies but often need the pellets to supplement. The amount should only be 1/4-1/8 cup though.