Could be, but we will never know.The low voting numbers could be due to the fact that the donors were not aware of the voting.
You haven't yet answered as to whether the SC has access to email addresses of the direct donors.
I'm sure the SC does and if they had emailed them (GDPR is not affected as the SC will only be writing to thank them and also ask for their vote participation) I'm sure the response would be much higher as you're connecting to an engaged audience.
Concerning money offered to the new owners - new ipad etc is laughable. Has the SC thought about fans engagement eg activities pre 1st home game, larger banners etc to make the stadium less sterile and have a more football feel (as opposed to Rugby).
They don't have them, but as you say could possibly have got them if they asked CF, but they didn't do an email shot for whatever reasons so is irrelevant(maybe because it would have had to be done via a third party, as I assume you need specialist software/company to email 4,000 emails).