...Are you just imagining things...
Are you implying that Consumer Reports (who did not recommend Tesla because it said the car's reliability is below average) making up stories to defend Tesla about its "beta" status of Autopilot?
However, you've got a very valid point on whether the status "beta" is LEGALLY documented, not just a common understanding through verbal instructions, advertisements, reviews, youtube...
On the owner's complaint of "veering in the rain," Tesla manual clearly says that:
"Note: Autosteer is a BETA feature in Release 7.0."
And as mentioned above, "veering in the rain" is a correct warning in the manual:
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"Limitations
Autosteer is particularly unlikely to operate as intended in the following situations:
• Autosteer is unable to accurately determine lane markings due to poor visibility (heavy rain, snow, fog, etc.), or an obstructed, covered, or damaged camera or sensor.
• The road has sharp curves or is excessively rough.
• Bright light (such as direct sunlight) is interfering with the camera's view.
• The sensors are affected by other electrical equipment or devices that generate ultrasonic waves.
Warning: Many unforeseen circumstances can impair the operation of Autosteer.
Always keep this in mind and remember that as a result, Autosteer may not assist in steering Model X appropriately. Always drive attentively and be prepared to take immediate action.
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So it may be true that Tesla does not emphasize the word "beta" or calling its owners as "Guinea pigs" on its website, but when Consumer Reports reads Tesla manual that is full of warnings and disclosures of restrictions, limitations, failures, potential mishaps, injuries, and deaths, Consumer Reports, who is not a lawyer, does not hesitate to call Autopilot as "beta" and its onwers as "Guinea pig."