Ouch! That jagged tear says the liner is brittle. It could be just a bad spot from where the previous owner let shock or pH adjusters settle on the bottom. You should be able to patch it. A local pool store might have a piece of liner scrap that you can use as the patch if you don't have any.
Well, I must not understand what I think I do about hydraulics. That water has an open path to the vermiculite bottom of your pool. That substrate is certainly not waterproof and should be absorbing VERY large amounts of your pool water until it's all gone.
I do not mean to be an alarmist but someone correct my thinking if there's a good reason for the water to stay in the pool.
This is certainly not what I would expect to have happen. However, if there was something waterproof below the liner the weight of the water could be sealing the bottom against it. Regular concrete, while not truly waterproof, would be waterproof enough that it could maybe have this effect. More likely would be some of the foam padding products. If there is a "flap" of liner that can be folded back, it should be possible to see what kind of material is down there.
Neither a pool cleaner or brushing would cause a jagged tear like that unless there was already significant damage of some kind. They could, however, have completed tearing open a section that was on the verge of failing for some other reason.
If you had a concrete bottom, I guess I could understand the pressure from above is holding the liner tight against the concrete and the concrete is absorbing the water VERY slowly. That said, I've never heard of a liner pool having a concrete bottom so, if it's vermiculite, it should be sucking it up like a sponge.
Any indication anywhere that your liner is starting to float?