Forgive my ignorance , but is this a heat pump water heater ?
Sounds like there is a crack either in the threads or around that area .
Only thing I can think of ie try brazing up the area with a brass rod & torch . Sounds like you have exhausted the list of common sealants .
Sooner or latter m you will / would have had to replace the tank . So , if you replace it now , you are not going wrong .
If you have a cutting torch or maybe even a saws-all & metal cutting blade , it may be easier getting the tank out of the basement ? Just be very careful up and down the stairs . ( basements are rare around here . )
Best of luck to , my friend , :-)
Wyr
God bless
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