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The "single piece" method he is talking about is that the individual _rings_ will be made of a single piece with a single weld, and the rings are then stacked. You can see it already in the Starship under construction in Florida. (Look at the unstacked rings.)

https://twitter.com/FarryFaz/status/1170535411678101504/phot...

https://pbs.twimg.com/media/ED6Tva7XYAESQJJ?format=jpg&name=...

They will not do a helical weld because the steel's thickness varies from the top to the bottom of the cylinder, according to Elon Musk. https://twitter.com/HarryStoltz1/status/1162595874561617920 https://twitter.com/elonmusk/status/1162601447235604480?lang...