small business vs small business sector

[GoesStation]

Here is an example from an Australian website:

Senator SCHACHT —When the Small Business Forum have a meeting and make a recommendation that they think would be useful to develop small business in Australia ….

The guy is a NATIVE speaker of English. This must be correct English.

That's a transcription of spoken English, which is inevitably more relaxed than most written English. You shouldn't take spoken English as representative of correct written English.

Can it be possible that some native speakers are just not familiar with this usage because they haven't had experience with it?

This is really a gray area, as I suggested above. But the more I look at it, the more I think it's acceptable in many contexts.