What's odd that many people who tried stellate gangelion block found complete relief from smell and taste issues . So this whole "damage" issue might not be the reason for this cause
My concern is sample size of two patients for the article. Still, if it's a common procedure with low risk, it sounds interesting enough to look into.
https://www.newsweek.com/woman-covid-symptom-food-taste-awfu...
Shop around for docs that do this because some charge quite a bit while other provide a good price