In the relatively small/niche market that is rugby, for a premiership club to secure a sponsorship deal with a global telecoms company is quite a coup (obviously we don't know how much they are paying for the privelege).
Vodaphone is the type of company that sponsors on a global scale.
I think the 5g thing is just promo nonsense to accompany the announcement. Ericcson supplied an internal wifi system to the area around the Ricoh (so what's going to happen to that) whereas 5g is a mobile phone network signal.. unless they mean they are using higher frequencies for a new internal wifi system again.
Either way, I think its positive news for wasps and raises the spectre of doom around JLR.