From memory there was briefly an explanation given as to why Null & Void was not an option.
It went along the lines of the strict definition of Null & Void means that it is "as if it never existed" and, as such, if it never existed TV companies, sponsors even Season Ticket holders could not only claim a rebate for the outstanding games but could also claim back the money for the games that had been played but now didn't exist.
This was proved to be nonsense and very quickly the narrative changed to simply repeating the line ad nauseam that "N&V, as has been pointed out previously and explained, is not an option".
Even pointing out that it was nonsense and suggesting that, if the definition of N&V was the issue, you call it "incomplete" was simply ignored by those with the original agenda.