In reality, the government that has "control" of the entities and dilutive / functional control / ownership of 79.9% of the stock and 100% of the voting interest, evidencing control; already by accounting rule ... in the US known as GAAP should have already "consolidated" both of the GSE's into their financial statements.
The fact is the 80% threshold is not the critical factor... its "control" and they have it.
This is an accounting myth they've conjured up on everyone.
But, hey they don't have to follow SEC Reporting Guidelines, now do they.