Please pay specific attention to the definitions of a "dealer". Note the difference between that and someone who is selling an item in a private sale that does not meet the definition of a "dealer". Please also note the provisions of 18 USC 922 (d) and note that stating "I may not pass a background check" is not sufficient to meet the prohibition, unless said person actually indicates they are a prohibited person.
As noted in the article, no laws were actually broken. Bloomberg is on a fishing trip and would best be served by cracking down on the criminals in his own city that actually break the law and provide firearms to criminals. Not holding my breath on that.
As noted in the article, no laws were actually broken. As I stated before, do a google on no laws were actually broken.