While he was hyping his own product and then said 'Condenser (mics) have no place on stage, or on radio, or used by Hams . . ." Sorry; that is wrong. Mics are carefully specifically chosen by sound engineers for specific purposes. Picking the right mic for the right job is an art itself; the best engineers always will. Nature of the beast.
Frank Sinatra - back in the day - wouldn't perform live without his trusted tube condenser mic (IIRC, it was the Telefunken U-47).
It is probably true that radio stations do use the EV RE-20/27, the Shure SM-7, and the Heil PR-40.
But some also use the Neuman U-47 and other condensers too.
Feedback really isn't an issue when broadcasting. It is for live on stage. But even then, live audio engineers will just EQ the mics and position them so that feedback isn't an issue and the quality that mic brings into the mix can be realized. I've used a pair of overhead condenser mics on drum sets when doing live sound or recording. Just because, you just can't get the same audio character out of a dynamic mic when trying to get certain audio effects than you can with a nice condenser mic in certain applications.
I run a tube condenser mic w/o any EQing on my HF rig with an endless stream of audio compliments alongside guys who run the EV or Heil mics. They also run with EQing, compressors, and spatial effects too. Ham radio audio requirements @ 4khz wide is best accomplished by keeping it nearly as flat as possible and as sensitive to catch the subtle changes in the human voice - if one wants an accurate reproduction anyway.
I can and have run a dynamic mic; but sometimes one ends up having to EQ them to the point where one could have chosen a decent condenser mic and had to EQ less. Unless one isn't really careful EQing; then the sonic quailty can be harmed more than it can be helped.
IOW - I don't buy all of what he was saying. I've been using and buying microphones for years and ran my own live sound company (for some major artists) and small recording studio too. I did all of my own research for ALL of my gear and had to put my money where my mouth was and got the attention of many in the local field for that work. I like Bob Heil and his mics; but some of what he said just isn't so. It was hyped and nothing more.
I like Bob's mics. He has a great business. But I would take some of what he said in that video with a grain of salt . . .