It is difficult to tell from the video, but it looks like the pond is probably well above its normal pool elevation (water level). How much rain have you had lately in the area?
Many trees can survive wet roots for a limited amount of time. When the water level goes back down most will probably survive.
The other option is that it is not actually a "pond", but rather a shallow water retention/infiltration pond that Texas construction codes may require to offset the hardscaping of the adjacent housing developing.
I would recommend walking completely around the pond. You should be able to determine where the water comes into the pond and where it exits. Also are the banks newly constructed? (Like 1.5 years old if the housing development started 1.5 years ago.) Finally are they using dirt to raise the foundations of the new homes to a little bit above grade? If so, then that might be a "borrow pit" rather than a pond.
If it is not truly a pond, then it might degrade the value of the adjacent house, rather than enhancing it. If you are not confident in evaluating the situation yourself, do you have an "expert" buddy you could ask/pay? It would probably be well worth it considering the price of the property investment.
Thank you SO MUCH for this! I've sent the info to my agent so we can get this figured out. I'll be bummed if it's indeed a a borrow pit or a shallow retention/infiltration pond because I really like this property, but I need an educated assessment so thanks again for the direction.