If you are asking is there a seal from the plate to the rod? The the answer is no, it is only soldered. The only seal is around the connection on the wire pole, and the rubber seal that goes between the sender and the tank.
I would just take the tank out and make sure you do it the right way. To many "what ifs" otherwise, and we are talking about a combustible material, so best to just make sure everything is air tight back there. I don't like reading all these stories on Hagerty's sight about guys classic cars catching fire, for bad/dumb luck.
Just my 2 cents, from my experience being around fuel.
Now if you were working on an 80's Toyota , I would say its good to go, and make sure its fully insured....