I think the idea that the self is "illusory" is a tricky thing. I wrote about this in the contexts of cognitive science and Buddhism:

https://medium.com/science-and-philosophy/does-neuroscience-nullify-the-mind-a03f7bc80af6?sk=0465bfb163c50e2c787cebf49b14a520

https://medium.com/the-apeiron-blog/buddhism-and-the-venture-of-limited-selves-beb4a25bfc08?sk=6584f3a565e2ef14433f4ffbce04477b