Not quite. US 240V is “split phase.” Here is a link to a Wikipedia article about it. I can’t claim to fully understand the reasoning, but split phase is somehow different from 2-phase. It seems to have something to do with a rotating E-field. My 35+ year old high school physics is failing me on this.
However, I do know for certain that the voltage converter you’re using is robbing a small amount of the extra power that using 240V would otherwise make available to you (assuming you have a V2 Bullet). The hard facts are that the US 120V supply provides less power (1800 Watts on a 15A circuit) than the EU standard 230V system (2990W at 13A, which I’ve read is common in the UK - not sure about EU, proper).
Note that @jacob mentions in his reply below that 8A is required to run an EU V2 Bullet at 240V. That’s 1920W - more than an 1800W circuit can hope to support. Since I’m looking to actually use the extra power (full loads to second crack), I can’t sacrifice anything to a voltage converter.