The extension itself has no time zone. It is set based on the data in Airtable. If the date field in Airtable is set to "local" time zone, that means it'll be sent in UTC.
Create a new formula field to format the time zone. Follow this article on Airtable to see how:
Use the new field in the extension settings instead of your original date field. Both fields might look the same to you, but in reality, they're interpreted differently.
This workaround is needed in most use cases. Otherwise, the time will seem off.