There are a couple of threads on here about delta fix it emails and ultimately the answer to the question of whether or not an interview is imminent is "it depends". If you got the fix it after a delta pilot emailed your name to recruiting then it might mean nothing because DL was obligated to review your app. If, however, the fix it email came out of the blue, that is a really good sign because it means your app was competitive enough to get pulled and reviewed on its own and is likely to result in an interview the next time it's scored by a recruiter (assuming the errors are fixed).

In your case though I'd imagine you'd be in the very short stack for an interview regardless of what triggered your app to get scored. The issue now is that there is no consistent timeline for when they'll look at your app again. For some guys it's a few weeks, for some it's months, and some never hear another word. Hopefully the huge hiring numbers for 2020 will mean you won't have to wait long.