Ron, here's the Vermont Law from the link on that page:
(b) A person holding a New York fishing license may take fish from the Vermont portion of Lake Champlain provided the state of New York grants the right to fish in the New York portion of the lake to a person holding a Vermont fishing license. In this case, a person holding a New York license may take fish in the Vermont portion of the lake in accordance with rules adopted under this part and shall be fined pursuant to section 4515 of this title for violation of the rules while fishing in the Vermont portion of the lake. In this section, the Vermont portion of Lake Champlain means the portion of Lake Champlain which lies within Vermont waters up to the mouth of any tributary river or stream, and shall not include any waters on the east side of the railroad fills at Malletts Bay, the Gut, and Pelots Point.
My understanding is that you have to follow VT regs in VT waters, as long as you don't have undersized fish or over the limit, out of season, etc., you should be OK.