I guess this is difficult to prove. I'm not sure if it matches with the definition of "abstract concepts" but I was reading earlier today that Bottlenose Dolphins "transmit cultural knowledge across generations".[0] So maybe yes?
[0] https://en.wikipedia.org/wiki/Bottlenose_dolphin#Tool_use_an...
If I tell you that you can put a stick in a certain tree and get honey out, that's different from me bringing you to that tree, putting a stick in it and showing you the honey (while being swarmed by angry bees but I digress).
Signals of many kinds are however certainly integral to language. Why are Jose discounted in your point of view?
It's similar to being able to use tools (which we've seen in many species) versus being able to create tools (which we've seen e.g. in certain corvids). The former is a significant first step but the later is what proves a certain amount of abstract thinking beyond the immediate here and now that goes far beyond mere instinct.
There is some research with great apes that makes the rounds every now and then but the findings are dubious at best as there's a lot of conflict of interest, handwaving and wishful thinking (see Koko "mourning" when told that Robin Williams died because they met once at some point in the past).
EDIT: Also it's probably a good idea to limit the conversation to social animals. Solitary animals don't have much use for communication other than challenging the competition and impressing potential mates -- insert celebrity joke here.