If there is ppl around capable of updating anti-cheat, I'm pretty sure they will be capable of packing SGA using Relic tools they used to make them.
Afaik the game hasn't received any content updates for over 6 years. For all we know Relic simply switched operating systems since then and none of the older tools work anymore. I don't know any of the details, hell I don't really know anything about modding, I just heard that there's a lot more going on in regards to why Relic won't/can't allow mods at this stage than them being unwilling to flip a switch. I think the work the community team, mappers and UI modders have been allowed to do for the live game in the past few years definitely hints or even proves that Relic has changed its stance on community contributions. But they're still a company and not a charity, so if the costs outweigh the benefits, it's only logical that they're hesitant to go with it.