Well about the bolded part - I don't see it. It seems like a thing people say for the sake of keeping things positive. What attacking quality exactly does he have? Is work rate a quality that really applies for an attacker? It's certainly not something we should be looking for in the first place, and yet it's definitely the strongest side of Antony.
I question his technique, dribbling (mostly because he only seems capable of going one way), and most of all I question his passing ability (and I am not even talking about his week foot now). Shooting I am not sure, he seems good with taking one kind of shot (curlers from outside of the box) but weak at every other shot he takes (for every curler he misses a sitter). I guess this has more to do with poor decision making and can be improved, but that is the case. People get overexcited to see him getting chances because sometimes the ball ends up at his feet, but I've seen Sancho and Bruno doing the same and making much more of those situations compared to Antony, who will basically always take a shot. It drives me crazy when he seems totally unaware of what's going on around him and never passes the ball (although I changed my mind on that and at the moment I believe he simply doesn't have trust in his passing). That will give him a few nice goals but over a season he still wastes more chances than expected.
I was told he just needs to work on his weak foot, or it's too early to judge, or that he had no preseason and so on. Well those excuses are no longer valid so let's see how it works for him now. I always considered him more of a midfielder because he seemed to have different tasks to all other attackers - keep the ball, stay wide, recycle, carry the ball forward, pass back instead of challenging the fullback. In that light he's quite useful, no issue with that. But a threat he is not.