Building a plasterboard wall on an existing wall

I have not found a photo on your website describing what you need. The TV cannot be kept on drywall. You need to drill drywall and load-bearing brick wall. If it is possible to suck dust from the holes in the brick wall and fill these holes with rapid set chemical anchoring glue and insert the metal M12 stud with the required length. After 20 minutes use the nuts to secure the TV bracket.

It won't let me look at you image on pinintrest but as I see it you have a few options, you can either plug and screw 25mm x 50mm battens vertically, directly onto the masonry wall every 600mm appart then use a taippered edge plasterboard and screw the boards onto the battens then use a jointing filler and fill all screws and joints, sand smooth and then paint. If you need the wall to come out further then make up a new stud wall using 100mm x 50mm timber every 400mm centers you can fix it to the floor and ceiling joists by either nail or screws (check for pipes and cables first) then fix your plasterboard to new stud wall.

Plug and screw too the wall, easy fill over the plaster board screws, sink the screws just enough so you can fill over then sand

You just need to batten out between supports and then plaster board as you would any other stud wall. You cannot hide the screws into the plaster board and that is why it has to be skimmed first before you paint or wall paper etc

your link does not work.
screw stud with screws and plugs. you screw the plasterboard to the timber with plasterboard screws. then you fill the screws with filler. then sand and paint. hope that helps