Hi Sergei,
Thank you for reaching out to the Google Ads Scripts Support Team.
We're glad that you were able to make use of the new feature in Google Ads Scripts without any issues, as I observed you had tried to create a video ad group. However, it does appear that your concern is regarding the Google Ads API's functionality and restrictions which we would be unable to further comment on. In the Google Ads Scripts perspective, generic mutates does enforce the same mutate operation or service that's being used via API.
That being said, I believe it's best that you reach out to their API support team by posting on the Google Ads API public forum so you're able to receive further insights as to why the request you had made using the aforementioned API encounters an error as well as it's restrictions. I've included a link below which you may navigate to.
In the meantime, you may opt to create the entity via Google Ads Scripts. If you would need any further assistance from our team regarding Google Ads Scripts or encounter any issues, please let us know so we're able to assist you accordingly.
Relevant links:
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Google Ads Scripts Team |