The survey is for admissions staff to complete and will ask about whether your institution intends to accept T Levels, and which HE courses T Level students will therefore be able to progress on to. The link to the survey is available here and should take no longer than 5 minutes to complete.
The Department values your participation in this and asks that you complete it by a deadline of 17 September. This will then allow schools, colleges, and T Level students to be more confident as they begin the UCAS process for application to higher education.