Many a time, clergy and ministers are common law employees of religious organizations to which they belong, as determined by various factors used by the IRS and the courts.  That's also why these individuals are issued W-2's, notwithstanding side gigs they may have in some other capacities and the fact that §1402 has a special provision just for the purpose of SE-tax.

On that basis, compensation reported on W-2 is income received for the trade and business of being an employee and should not be eligible for QBI.