Also, from that other thread (skimmed it a little bit):
OP/devs have had access to the devices for almost a year now, with the GD certificate.. So I'm failing to see the issue here.....
Also from the other thread: OP said they went with GD, because it "only took 10 minutes" even when ZeroSSL was offered as an alternative. Getting a certificate from ZeroSSL could have taken LESS than the 10 minutes it took to get an expensive GD cert... Multiple...
I'm at a loss.