The wall mount is compatible with the Samsung S85F, as it supports a maximum screen diagonal of 70 inches and a load capacity of 50 kg. The Samsung S85F is available in 55", 65", 77" and 83" sizes, with the 55" to 77" models weighing up to 28.8 kg and VESA dimensions of 300 x 200 mm to 300 x 300 mm, which is within the specifications of the wall mount. The wall mount supports VESA standards up to 600 x 400 mm, so it also fits the VESA 300 x 200 mm of the S85F. The maximum screen diagonal of 70 inches is exceeded for the 77" and 83" models, so the wall mount is ideally suited for the 55" and 65" models, for 77" and 83" models it could be tight or not fit.
The "Solid Articulating Wall Mount TV Holder" from Rs Pro is suitable for TVs with a maximum diagonal of 70 inches and a weight of up to 50 kg. The LG OLED55C47LA has a 55 inch diagonal and weighs around 16 kg with stand, which is within the payload. However, the VESA mount of the TV (300 x 200 mm) must be compatible with the wall mount, which is the case as the mount supports VESA sizes of 300 x 200 mm. This wall mount should therefore be suitable for the LG OLED55C47LA.
The bracket can hold the weight without any problems. What is important is the screw spacing on the back of your 85 inch TV (max 40cm). More important is that the wall holds it and that enough screws and plugs are used in the right places.
What do you mean? In my case, the TV is 11 cm away from the wall when it is "closed". At maximum arm movement, the TV is at a distance of 53 cm from the wall.