I’m not in the least surprised that there’s an issue with one of the items in the kit. I’m disgusted and appalled, but not surprised. It happens time and again, and all Hirons will do is avoid the issue until it goes away or she can’t avoid it any longer, then shift the blame onto the brand.
My guess is that she knew about this all along and that it’s partly how she’s managed to keep the price of the kits down. Anyone who’s bought a kit would be wise to check the manufacture and / or use by dates on every product in there because if this has happened once, it could happen again. It’s not a mistake.