I think the article is spreading false information as it's similar to mis-configuring ssh and then blaming the software itself when you get compromised.
There is no substantive discussion of that. The paragraph is:
"Another point of entry may have been a backdoor in software developed by a Czech company called JetBrains, run by Russian nationals, that supplies its software testing product, TeamCity, to 300,000 businesses around the world, one of which is SolarWinds."
The article then moves on and does not mention this again or provide any evidence.
https://blog.jetbrains.com/blog/2021/01/06/statement-on-the-...
Jet Brains published this statement.