>>517027539DEI is short for "Diversity, Equity, and Inclusion"
The implication here is that the many people that got into the Capcom Cup only got their slot because of where they live rather than actual skill.
The new Capcom format requires you to have been a resident in an area for at least 6 months in order to enter a tournament there. And since these are region locked online qualifiers, it guarantees that people will get in no matter how weak or irrelevant their region is just based on there being a slot there only for them.
For example, people find it contentious that the Swedish player JuicyJoe or the British player Broski got in because those regions were not considered historically very strong. Furthermore, the real issue is that regions that are considered stronger often get very few slots just based on their land size. Japan is historically the most competitive region for Street Fighter, but they have limited slots because the Capcom USA employees want to see a more diverse roster of players. They knew that if they had an open tournament in South Asia, there's a good chance that the winner would be from Korea or Japan anyway. By making the tournament be Indian, Bangladeshi, and Sri Lankan entrants only, it guarantees they will have at least one person that is actually South Asian in the tournament. This is the equity factor.
In the old days, these tournaments were truly open and anyone could enter. For example, SBO had foreign qualifiers, but anyone could go to them. It didn't matter if you were Mexican or BR. If you flew to the US SBO qualifier and won, you got their slot. Furthermore, they had an LCQ in Japan that anyone could attend.
But thanks to the new inclusive slots, this is no longer possible. There was not even a Last Chance Qualifier this year, as they didn't want a (likely stacked by Japanese) tournament to happen that would make the slots less diverse. The irony here is that the LCQ tends to be more diverse anyway.
Hope that helps you!
