I had been thinking about a comment on the same issue, but you beat me to it. I think there is a danger of making the word syncopation mean quite different things. My understanding of it as a musical term is that it is the process of accenting a note that would normally be unaccented. The resulting rhythms go against a regular pattern of strong & weak beats determined by the time signature. If the syncopated pattern itself is being repeated, then it doesn't alter the underlying stress pattern, so the syncopation becomes predictable, but is still syncopated. In the opening bars of La Trampera, the offbeat stresses only represent syncopation because they don't last long enough to superimpose a new pattern of stress, offset by one beat, relative to the first one. So strong, weak, strong, weak becomes weak, strong, weak, strong etc., but only for as long as the ear still expects the pattern to be the other way around.
What is wonderful about Troilo's piece is that it is so rich in its rhythmic patterns, but in a way that delights (whereas, for comparison, Biagi's Belgica is a nightmare.