Amy information who much that sponsorship costed? Usually such things are transparent so is not hard to find for all who monitor Spanish football.
I haven't found this info. You can ask the team in their Telegram group.
I can see the token was recently pumped, so I don't agree it is undervalued, if people think it worth your own valuation good, but IMO people will pay for something the value they think it duely worth, as you can see some people sold their Bitcoin recently for $6000
Even if token is pumped it can be undervalued. Look at numbers in sports industry. If they manage to take just 1% of this market, price would be much higher. But in the end it will all depend on their product - platform.