JetBrains response is here https://blog.jetbrains.com/blog/2021/01/06/statement-on-the-story-from-the-new-york-times-regarding-jetbrains-and-solarwinds/
Are people really concerned that this is a credible threat?
Surely it can be a potential threat but in most case there is a VERY long list of things you need to secure before it's reasonable to worry about your IDE
Other credible threats include every human who touched or has the ability to touch the configuration of their Team City pipelines.
However, the Times journalists should get some facts straight before flinging libel around. There are millions of JetBrains users for a wide variety of products. They're implicating all these products, and that doesn't seem to be appropriate. Breaking a text editor or IDE to introduce this class of attack seems unlikely, and much more prone to discovery.
Personally, everything about this smells like an inside job (or gross incompetence).