That may be invaluable advice; even two seconds of silence is wasted 'space' they don't want to have to deal with.
Introductory Movements, in the Synchronization Licensing biz were down to seven seconds, I read somewhere, recently.
I can see that being 'valued' in terrestrial radio too. They want short Songs, serving to keep audiences listening until the commercial advertising that pays the bills comes on. The 30 second, 60 second Intro., followed by a four minute Song doesn't fit that bill.
Much terrestrial radio is 'canned', piped in, with no 'in-the-studio' DJ sitting there 'jockeying discs'.
There was a train wreck some years ago and Law Enforcement went to their local radio stations to get the Evacuation Warning Order out to the public. There was no one there. The 'canned' radio in their community, they learned that day, in an emergency time frame, was piped in from 150 miles away.
Money motives.
www.audiosparx.com ???
www.landr.com ???

Folks may want to visit those sites (If those web addresses are accurate) and learn a little.
Transitioning from creative hobbyist to commercial venture, marketing product, is something most creatives have not 'studied'. It's a necessary education process to behave as a 'Company', formally engaging in 'Commerce' with other Companies. Some nuances of difference spring up, compared to engaging in Commerce with individual 'Consumers'.

There will always be another song to be written. Someone will write it. Why not you? www.garyeandrews.com