Correct. If you notice during last night's Apple Cup snow game, the font of the numbers on TV were different than the WAZZU font painted on the field. Meaning they were CGI generated. Great question.
The broadcasting system overlays those lines and numbers on the snow for viewers, same as the rest of the moving graphics on the field. See this for more explanation: https://en.m.wikipedia.org/wiki/1st_%26_Ten_(graphics_system)
Thanks! Your answer is awaiting moderation.