Nonlinear indicate in their appendix that they’ve decided against suing. (Source; it’s the paragraph immediately above the linked bookmark).
For my part I’m moderately inclined to be dismissive of the lawsuit threat, in main because the rule-of-thumb I’ve personally heard about threatening to sue is that, if you’re serious about it, you should consult your lawyer before you send the threat; I’m not a lawyer myself, though, and am unsure whether it gives the right output here (especially given that their preferred outcome was for Ben to delay the post without their suing).
Ben’s original phrasing (“My current understanding is that they’ve had around ~4 remote interns, 1 remote employee, and 2 in-person employees (Alice and Chloe).”) seems clearly to be referring to their total number of employees, not the concurrent number.
I sympathize with how you’re feeling here, and I agree that taking Nonlinear’s word for it without evidence would not have constituted fact-checking, but I think you may be falling into an arguments-as-soldiers mindset. If it’s not overstepping to suggest (and I apologize if it is!), I think it might be helpful to take a step back from this discussion and do something less stressful for a while, so as to hopefully return with less of a sense of urgency.