Someone posted the text of the offending paragraph last evening (I didn't keep the link to that FR thread). It didn't read as so 'innocent' or 'typo' level of error (IIRC).
At least that is what they claim.
In any case, to make that act legal, the IRS laws would have needed to be revised at the same time.
I think it is as they say, "a tempest in a teapot".
"Hereinafter, notwithstanding any other provision of law governing the disclosure of income tax returns or return information, upon written request of the Chairman of the House or Senate Committee on Appropriations, the Commissioner of the Internal Revenue Service shall allow agents designated by such Chairman access to Internal Revenue Service facilities and any tax returns or return information contained therein."Note the explicit repeal of all privacy protections and the availability of the loophole to any friend, contributor, or passing acquaintance of the Appropriations Committee chair.
[emphasis added]
If this is an "innocent error", I'm the King of Romania.