I think Steve is talking about the musical genre of “swing”, whereas you’re talking about “swing time” (versus “straight time”), which is all about the timing of the eighth-note beats that come between the quarter-note beats in 4/4 time.
Strum Machine’s “boom chuck” rhythm doesn’t play those in-between eighth notes. That means that you can play along in straight time, or swung time, and it won’t conflict, because the timing of the quarter-note beats (the “downstrokes” in swing guitar) is the same in both straight time and swung time.
That said, I very much want to, and plan to, offer strumming patterns that incorporate true swung rhythms. I posted my plan for adding additional strumming patterns. I’m not sure if I’ll have any of those ready to play with this year or if it will be early next year, but they’re coming and I’m very excited about it!