It does mention that it is controversial and was criticized for its experimental design. I think that is sufficient for what is essentially a eulogy for a deceased colleague.

I’m not sure what other commenters on here expect, but it would be extremely inappropriate to use this announcement as a venue to systematically criticize his research… I’m pretty sure that has been done already in a more appropriate forum.

At least flawed business case studies get cycled out once a new case study becomes de rigueur. Soft science tend to use flawed studies long after their flaws are exposed. Few people would use Welch's management style as one to follow but a number of people still think there are Unit731s inside everyone waiting for orders.

Regardless of how valid it is, it makes for some great movies.