“X supports the Green New Deal” is indeed highly subjective for some values of X. But that doesn’t include most Republicans, who have been consistently against the whole thing from start to finish.
I think the parent's point is that the variable is for some values of "Green New Deal".
It's like how Republicans (tend to) oppose "socialized health care" but support Medicare. A lot of politics is just playing with words, and "Green New Deal" offers plenty of ambiguity.
For example, say that the Green New Deal is a specific bill in a House committee. For some political reason (maybe the Democrats aren’t ready to vote on it yet), the Republican chair of the committee, Representative X, votes in favor of it. Thus an ad saying “Representative X voted in favor of the Green New Deal” is factually accurate while an ad saying “Representative X supports the Green New Deal” is debatably true.
