Time is an illusion. That sounds like a convenient excuse for ignoring the intentional flexibility built into these predictions. Even so, the predictions are only so flexible. There is a good chance that many of these events will take place not only after a May 15th date, but will occur across multiple years. It won't be possible to excuse that away, no matter how much of illusion you believe time to be.

Besides, this "entity" obviously understood May 15th just fine. So it must have a concept of months and days. Would it be that much harder to understand years? Particularly for something more intelligent and "highly evolved" than us petty humans. I mean, can the entity count? Surely numbers exist for it. That's how most of us comprehend time. You're telling me the "entity" was either unaware of the current year, or couldn't simply count 3-5 years ahead to figure out the numerical value associated with the year of the predictions. Doesn't sound very evolved to me.