Intermittent v Continuous
MCAS has a limited authority, and a continuous sensor fault would result in a single trim error to the limit of the MCAS system authority. That defect would likely be counteracted by any flight crew, as the speed was changing through the flight profile, and so pilot trim would be undertaken as a normal matter of course. Without having any information on the presentation of the fault, it would appear that there was intermittent failure and an ongoing change in the trim condition. It is also possible that didn't happen, and that would be a further human factors investigation issue.
Let's just stick to the facts.