Thanks for the kind words, @Taxing!

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So no housing deduction for Sch C income, but itemize deduction can be taken on Sch A without reduction of the excluded foreign income. All of $31k can be taken as itemized deduction. Is that correct ?

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In this case, based on the info presented, that would be correct in relation to foreign mortgage interest.  Deduction for foreign real property taxes, however, has been suspended under TCJA.

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The software took the QBI deduction. A foreign business is not allowed to take the QBI.

How do I stop the QBI deduction within the software ?

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That's because PTO doesn't know whether the business has any US-ECI.  You will need to toggle that on the Qual. Bus. Inc. Dedu. tab by entering 2 on the line for Business is a qualified trade or business: 1=yes, 2=no [Override].