I managed to miss this at the time. I only discovered it while doing a search for Yunnan. robert, the reference to pho ga was a touchstone for flavor comparison rather than suggesting a direct link or lineage between the two (despite the wording mentioning Yunnan neighboring Vietnam). Hot pot (or shabu shabu ) is a better comparison.
Some here have pointed out that the San Gabriel Valley versions of Crossing The Bridge noodles don’t compare favorably with those in Yunnan for exactly the reason you mention, lack of indigenous ingredients. The article was simply about where one can find it in the SGV, however it’s done.and whatever the quality is (compared to having it in Yunnan Province).