To state something such as "real" and or " illusion " means that there is a fundamental and demonstrable version that can be expressed in a identical way and by anyone and that it is the measuring rod by which all similar things are judged and so with it a person can say "this is real" or "that is "illusion " but unfortunately no such thing exists or has ever existed because everyone experiences a slightly different life and do to are perspective we create an opinion of the world and that opinion is just are own illusion because no concept/ perspective on life is demonstrably true because you cannot fit reality into words and concepts you can only experience it in the present moment. So like I said before
This is the real world but your understanding/ concept/ view of it is what's not real.

Edit for stupid voice to txt sabotage