Please see example 1, below, taken directly from TT's linked help section under the Schedule E question: "Did you use this home as anything other than your primary home?"

Very clearly it seems to be TT's take on settled tax law that rental of primary home after you move out is NOT nonqualified use as long as the home qualifies for Section 121 exclusion upon sale:

NONQUALIFIED USE OF A MAIN HOME

Simply described, "nonqualified use" means any use other than as a principal residence after December 31, 2008. So, for example, use as a second home, vacation home or rental is considered "nonqualified use" beginning in 2009 or later. However, "nonqualified use" does not apply to time that falls into one of the following categories:

1. Periods of time after its use as a principal residence.
2. Temporary absences due to a change in employment, health or unforeseen circumstances.
3. Any period (not to exceed 10 years) during which you or your spouse (if married) is serving on qualified official extended duty as a member of the uniformed services, the Foreign Service, the intelligence community, or as an employee or volunteer of the Peace Corps.

Here are a few examples:
1. After owning and living in it for several years, you move out of your main home on August 1, 2025, and rent it out for a year before selling it. The time it is rented out doesn't count as "nonqualified use" because it is AFTER being used as a principal residence.
2. You purchase a vacation home in 2008. It is not rented or used as a principal residence until August 1, 2025 when you move into it and make it your main home. A couple of years later, when this home is sold, the amount of time the property was not a main home after December 31, 2008, is considered "nonqualified use". In this example, the property was a vacation home between December 31, 2008, and July 31, 2025, and none of the exceptions apply, so that time must be considered "nonqualified use".