i mean i only ever tried to read auf weiners and besume muchacho and the only one i read up to date was lily of the lamplight so i dont have all the receipts or anything but just from what i read:
his stories had pedophilic undertones, belittled the jewish victims, the italian resistance, the polish home army, and fetishized the gay couples, completely ignored the actual real LGBT struggles at the time, and applied present day Boy-Love Yaoi power dynamic tropes from japan onto these european men living in the 1940s
but thats just all the “yikes” stuff i can remember, thats not even including all the plot holes or historical inaccuracies or shit he would write that just plain didnt make sense.