The TypeScript Tax: A Cost vs. Benefit Analysis
medium.com
medium.com
As for the ROI analysis, the article clearly states that the objective data was too noisy to use, clearly explains why, clearly states which data is subjective, and provides readers with guidance on how to interpret the subjective data.
There's nothing dishonest about it. It is not "science", and does not claim to be, though it does cite some real science. It is an anecdotal opinion piece, though that opinion is well informed and supported by some "real science".
It should be interpreted as an anecdotal opinion, not a formal research study -- as with any small data sampling. You can't draw definitive, objective conclusions from it.
Some people have had overwhelmingly positive results with TypeScript. We need a lot more people to share their experiences before we can start to say anything objective about it. Please don't discourage them from sharing their opinions, no matter which side of the ROI spectrum they favor.