The U50S6806 supports a newer WiFi standard than most TVs that have been on the market for around the same time as it. This TV supports an 802.11n WiFi standard, whereas most 4K and 8K TVs that are a similar age to it support an 802.11a WiFi standard. In addition, this TCL-Digital TV support an 802.11ac and 802.11g WiFi standard.
This TV's WiFi standard (802.11n) is in fact the best supported WiFi standard amongst all televisions of a similar spec and age to the U50S6806.
Amongst similar types of TV the worst supported WiFi standard is 802.11a.