That's not new information though? That's what everyone, including the lawyer I spoke to, have been saying all along?
No ECI = no US tax = no branch tax.
The risk my lawyer mentioned was that the IRS would claim that something like a meeting in the US would constitute "physical operations in the US" (ECI), and that they could get the idea "hey, maybe we can get some tax out of this guy" after seeing a 1099. If you can prove you've never even set foot on US soil, then I think one should be good. The question is how the risk would change depending on how many days one spends in the US.
Still it seems like your︀ lawyer considers that risk negligible, which is very good to know.