What makes you think that?
The tech industry on aggregate has plenty of disdain for MBA's, both the degree programs and people with those degrees. Some of it is deserved, but MBA's aren't automatically BS degrees.
And if it can flip you from an marketing engineer in a fading semiconductor fabrication (Applied Materials) industry into a leading a $1-2 Trillion adtech/AI company and equip you with the skills necessary to handle being on the frontlines of a DOJ trial.
https://magazine.wharton.upenn.edu/issues/spring-summer-2020...
A less known aspect of IITs in the past is their gaming of the GRE/US grad school application process, ranging from straight out cheating in the GRE (in the paper-pencil version, IIT students were given a single block of time for all sections rather than having time-limits for the sections, a blatant cheat made possible by their self-proctoring), to creating GRE question banks by collectively memorizing the test, to using the Australian time zone (ahead of India's) to find out the questions on the GRE. When applying to grad school in the US, IIT students would divvy up the schools among the graduating class so that no more than 1-2 would apply to top schools and claim to be in their class' top 10%, regardless of actual standing.
So, anytime I see an IIT grad at work, I'm not really impressed by that aspect. The fact that Satya isn't from an IIT is of no consequence and actually makes him more credible in my eyes.