Boom and other proponents of lifting the supersonic aviation ban are trying to cause confusion between engine noise restrictions (relevant at takeoff) and the inescapable noise from a passing shock wave that is the byproduct of supersonic flight.

From the amendment text (https://www.commerce.senate.gov/public/_cache/files/0238c447...)

Proposed rule:

2) specifies a noise standard for sonic boom over the United States that—

(a) is economically reasonable and technologically practicable;

(b) is informed by noise levels that are tolerated in the United States for non-aviation purposes; and

(c) will foster employment in aircraft and aircraft engine manufacturing in the United States.

In other words "fuck you, we can make it as loud as a jackhammer".