No, a valuation is intended to be today's valuation, the price, for example, that a "willing buyer would buy from a willing seller" ("willing" taking the "distressed seller" out of the equation). You are right it is all about the future, some expectations and the risk of those expectations being right about future events.
So, pre-covid-19 and post-covid-19 valuations should be very different. The first would assume that Premier League tv revenues are somewhere around this season's levels, maybe some future growth or maybe a little downwards pressure. Post-covid-19 there are a lot of negative pressures on valuations.
Of course, a number of assumptions will need to be made about the range of future outcomes. I'd expect the most critical will be how long it will take to have an effective vaccine for covid-19. The second would be how quickly the economy will return to the levels before covid-19.