Yes:

https://www.chase.com/mybonus

The form asks your last name, last 4 digits of credit card, and your zip code. In other words, it's legit.

I got the 5X bonus. The exclusion of Target and Costco (except grocery delivery) is buried in some legalese about the category the merchant selects to describe their business.

And, the maximum total spending to receive the bonus is capped at $1,500 per month. Starts 8/1 and ends 9/30.

By the way, I never received an email regarding this promotion.