Yes they are readily available via anyone with a brokerage account.   Yes they could be reasonably used by investors who want to allocate a portion of their portfolio to high risk investments.

Your comment however was clearly suggesting that one fund manager's success trading high risk bonds from stressed corporations that were operating in a highly stressed sector were evidence of a "bond market".  Which by definition would be comparing them to the mainstream which would include telecom, banks, utilities, and the other major corporate bond issuers who are clearly not anything close to what the Paramounts of the world were in 2015/16.

No rationale person would suggest that fringe activity is evidence what is happening in the mainstream.  Perhaps my comment wasn't the most cordial but your one track posting ad nauseam can wear a little thin as well.