Correct. For example, let’s assume the average earth temperature today is a fraction of a degree C warmer than it was say in 1800 (and I think most experts would agree this is the case, regardless of their opinion about “warming”), the real question is “why”? If, as I believe is the case, the cause is 80+% due to natural factors and <20% due to human activity, I suppose you could say that proves “global warming is real”, even thought one year will be colder than another.
But the real bottom line, to quote our infamous former SecState, is “what difference does it make”? Of course climate changes, and of course that means on a long-term basis there is global warming and there is also global cooling. What matter is that the activities of mankind have virtually nothing to do with it.
The earth warmed up from the last ice age with 0% human input. I suspect it will cool down again at some point with 0% human input involved in it.
If an ice age started today and in 20 years we saw massive glacier growth, shorter summers, etc. the Warmunistas would still insist that it is caused by AGW.