Is returning for one who stood up from the first tashahhud absolutely required?

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The questioner : ...

The Shaykh : Look, may Allah reward you. As for the matter we do not see a need for you to be strict about, I say: if you stand up from the first tashahhud and you continue standing, do not sit down, and perform the prostration for forgetfulness. Do you understand? And if you do not continue standing, return and do not perform the prostration for forgetfulness. This is the ruling.

Source alathar.net

The Arabic text is copied verbatim from the original source, without any edits.

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