It should be noted that is based on presumed party registration data from OTHER sources.

Texas doesn't have party affiliation at the time you register. If you vote in a primary, attend a state convention, or sign a candidate's petition you will be affiliated with that party for the remainder of the election cycle (so you can't vote in the other party's primary).

If you didn't do any of those things, you won't be affiliated. So, I would be hesitant to ascribe any significance to party ID.