I was expecting yet another aspartame-bashing article, but it's an erythritol-bashing one this time.
Look, it's really simple: all those sweeteners have been in widespread use for a long time. Wanna know if they're harmful? Do some stats correlating release dates in several countries and occurrence of this-or-that disease and death records. If you can't find a statistically-significant correlation, well... it doesn't prove the stuff is harmless, but chances are it is.
That's assuming there aren't already a kajillion inconclusive studies on the particular molecule you're interested in, as with aspartame.