XIVLauncher is a non-official app, made by a modder, which does not work properly after Endwalker. Thats why she said it. The official launcher is "FFXIVLauncher".
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Playing on dx9 stops these crashes for me, sadly it let's my audio pop alot and generally reduced my FPS BUT it's atleast not crashing randomly anymore!
Maybe that helps ya too! ^^
The Moderators here are not tech support agents, they will take your report and add it to the list of unreproducable closed issues but they will not offer you any actual help for fixing the issue beyond a list of common fixes that has almost no fixes for the actual issues users experience commonly in these DX error threads.