No and no.
If JR wanted something in the press he would leak it to a reporter like he always has.
Not sure where Michael Reinsdorf would fit into this as he seems pretty busy running the Bulls into the ground. I also don't get the impression he needs to satisfy his ego boost for attention by creating a secret Twitter account to undermine his Dad's work.
If the initials are intentional it is because someone out of the inner circle is trying to be cute, not because a Reinsdorf couldn't think of something smarter for a screen name than his own initials.