I recently read an article that claimed that President Biden as of the 7th of June 2021 had given only one "real" press conference, where the reporter defines a "real press conference" as one in which the President stands at a podium for a considerable amount of time (at least 30 minutes?) and takes questions from randomly chosen reporters with follow up questions allowed.

This is at odds with statistics from the American Presidency Project, which claims that Biden has held 6 solo press conferences and 3 joint press conferences.

If we define a "real press conference" according to the standard described by Tom Jones in the article linked above, how many has Biden held and what were the dates of those events?