quite a saga with no definitive info
first Turbotax does not do form 5471
second I have provided a link to that form's instructions. there are multiple categories of who must file but
look at your ownership % on the k-1. then read about the categories of those that need to file in the instructions carefully. you'll probably realize that all categories require a 10% or more ownership in the foreign corp before there is a filing requirement. if you don't own 10% or more in the MLP its impossible for you to own 10% in the foreign corp. thus there is no 5471 filing requirement.
as to High-taxed income that's irrelevant in your situation.
HTI also referred to as HTKO only requires that if you paid foreign taxes on such income (you say the form shows none) then the income and foreign taxes are reported in the general category on form 1116, not the passive category
see this link for more info
https://www.irsstreamlinedprocedures.com/htko-high-tax-kickout/#:~:text=%E2%80%9CHigh-taxed%20income...
k-3 is about 20 pages. based on what you provided and assuming you don't own 10% there's nothing to report in your return. this is the same for the millions of taxpayers who invest in MLPs. That's a lot of trees that were killed for nothing.
