There's nothing in that rule 11 about amending pleadings.
Rule 63 basically says that you can file amendments freely except when it comes to trial. TCPA is not a trial. There's a squiggly bit in the middle of rule 63 that suggests that filings can be tossed if they surprise a party, but reading it in concert with related rules (66, and 166) suggests that that really only means amendments within 7 days at trial. Tossing an amended pleading for 'surprise' also requires some showing of surprise, which I don't think was really a thing. Almost nothing new was in the 2ap
Regardless Chupp allowed the affidavits.
Caselaw on rule 63 suggests its VERY permissive, so absent a trial date I think amended pleadings pretty much have to be accepted in texas.
See
Opinion for Grand Prairie Hosp. v. Tarrant Appraisal D., 707 S.W.2d 281 — Brought to you by Free Law Project, a non-profit dedicated to creating high quality open legal information.
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"We hold the same to be true under rule 63's requirement that leave of court be obtained before amended pleadings can be filed within seven days of trial or thereafter.
The rule applies in instances where there is a trial on the merits of the case. It does not apply in the instance of a hearing on a plea to the jurisdiction, as such is preliminary to a trial on the merits. Therefore, we will consider appellant's amended pleadings as the "live" pleadings in this appeal. "
This has a STRONG suggestion that any hearing that is preliminary of a trial on the merits is permissible for the plaintiff to amend their petition as they please.