Nothing has changed in the way GSX publishes and set its own variables. It's simply possible the author of the Linda scripts might have made some assumption about timings, or when things happens, that could require an update of the Linda code.
Door automation is not as easy as it seems, we'll be forced to do it in GSX for MSFS, because most default airplanes don't have any way to open their doors under users control, and it's quite tricky, because the code must be sure no open commands will be sent twice, which changes depending how many stairs the airplane has and when all GSX stairs all reach the door so, it's tricky for us, I guess it's even trickier for an external program.