Well, I don't think it prevents a UTI, but the article indicates if consumed concurrently with the appropriate antibiotic for the specific bacteria in a specific infection, the conversion to DIM from the broccoli ingredient might cause the reduction of the insulating 'biofilm' to allow the medication to be more effective at successfully killing the bacteria (and thus maybe prevent a resurgence from any lingering, individual, resistant bacterial organisms to lurk and cause a rebound infection). A two-pronged approach to therapy that is often needed in chronic UTI patients like myself. At least, that's what I inferred from these articles. Typically in the past, when the first line antibiotics fail, doctors turn to Cipro to finish off the job.
Ciprofloxicin has a very real downside doctors don't talk about much, either because it's the easy med to guaranatee UTI cure, or they truly don't know about the side effect. I like to think it is the latter. If you're interested, Google "Cipro is poison" sometime. I have experienced much of what is described in that article. Cipro (and all drugs classed as flouroquinolones) has an accumulative negative effect on muscles & tendons. Even my PCP isn't aware of this side effect. Those few doctors that seem to know about this, use it less for stubborn UTI's as they have in the past. At least that's the trend I'm seeing in urology departments the past 15 years or so. I myself have taken Cipro probably 10 times in my life, as I have suffered chronic UTI's that often didn't respond to the first-prescribed med. I definitely experienced some of the nasty muscle/tendon issues flouroquinolones cause with repeated usage. For me, this occurred in the summer of 2019 (year before COVID-19). My walking was impaired, couldn't bend my elbows, had calf muscle spasms so painful I screamed out loud in a dead sleep until the muscle relaxed. Cipro muscle/tendon damage is accumulative and irreversible. It has sadly led to total paralysis in some patients. In my case, muscle disuse was for a few months that year but I could trace those symptoms to the months immediately following my last RX for Cipro. So I definitely think there is something very real to this little know medication side effect. I try to avoid Cipro now so as not to have any further issues. So if eating broccoli, bok choy, cauliflower, cabbage, kale consumption helps the first-line antibiotics do the job, I'm all for it. I love all veggies (but beets), entonces no hay problema!
If it helps with COVID symptoms one day, hey, that's even better!