Making a fake wall to mount a tv, easy as it seems? will the fake studs be able to carry the same weight?
If the fake studs are mounted to the real studs, there should be no problem. We have been hanging mirrors weighing several hundreds of pounds by screwing into studs for hundreds of years.

It is important that your aesthetic wall is well anchored. Numerous screws into numerous studs. Then make sure your TV mount has several screws into the new studs. 3/8 or 1/4 inch lag screws are a good choice.