This actually allows for the release not blocks it.
"The law is clear that the House Ways and Means Committee can now make Trump’s tax returns public if a majority of the committee members vote to do so.
The relevant statute,
Section 6103(f) of the Internal Revenue Code, instructs the IRS to release otherwise-confidential tax returns or return information to three congressional tax committees—the Senate Finance Committee, the House Ways and Means Committee, and the Joint Committee on Taxation—upon written request from the chair of any of those panels. The statute also instructs the IRS to release returns or return information to other congressional committees under a narrower set of circumstances."
A victory at the Supreme Court has set up a quandary on Capitol Hill.
www.lawfareblog.com