TaxLawyer1978, while I don’t give you or anyone advice, consider whether there might be some arguments in another direction.
A Federal income tax rule suggests arguments that a self-employed individual is an employee for a year in which she has any earned income, and also for a year in which she rendered some personal services (even if her business provided her no earned income):
(b) Treatment of a self-employed individual as an employee.
(1) For purposes of section 401, a self-employed individual who receives earned income from an employer during a taxable year of such employer beginning after December 31, 1962, shall be considered an employee of such employer for such taxable year. Moreover, such an individual will be considered an employee for a taxable year if he would otherwise be treated as an employee but for the fact that the employer did not have net profits for that taxable year. Accordingly, the employer may cover such an individual under a qualified plan during years of the plan beginning with or within a taxable year of the employer beginning after December 31, 1962.
26 C.F.R. § 1.401-10(b)(1) https://www.ecfr.gov/cgi-bin/text-idx?SID=2ed955aaf30998b5f81b0ccb8bd185b9&mc=true&node=se26.6.1_1401_610&rgn=div8
And the rule doesn’t say ‘for IRC § 401(c)’; it says ‘for IRC § 401, which includes § 401(a)(9).
The decision-maker would want to get into the details of the partnership agreement and the partnership accounting to discern whether the 70-something really is a partner. And did he render some personal services? Did he at least make a few courtesy calls to placate clients?
If we were debating whether an employee has a severance-from-employment to permit a distribution a plan otherwise would not provide, some (perhaps including the IRS) might argue that part-time work—even a substantial reduction “in the number of hours that an employee works”—is not a severance. See, by analogy, 26 C.F.R. § 1.401(a)-1(b)(3).
I don’t suggest these arguments resolve all questions or even lead to a sound conclusion. But a plan’s administrator might get its lawyer’s advice and find there’s enough to support an interpretation that the plan doesn’t compel a minimum distribution.