You are correct.
I had the wrong list.
The deadline for independent was May 9 (2 days ago)
http://www.sos.state.tx.us/Elections/candidates/guide/president.shtml
Good.
The Libertarian convention starts 05/27. So time is very short for that avenue too.
Looks like they are probably left with running in select states claiming to attempt to throw it to the house, while actually working to keep the gravy train rolling under Clinton.