In my opinion:
It is 'hidden' according to the text, as demons are escaping from Hell (Isaiah 24:18, Isaiah 14:9); thus Yeshua has been set as a snare to catch them, and thus many are blinded to seeing what the text truly means (Isaiah 29:9-14).
Wouldn't say it is hidden tho, just obscured by our own naivety...
Like some bits are really basic, first changing his name back to Yeshua (salvation), and then we see 'why we should search the scriptures for salvation'.
It is also hidden as it isn't all explained in a straightforward manner, often it is in cryptic prophetic statements, that only make sense when we look at the whole of time....
So whereas Jews generally try to look at each individual section in a historical grammatical context, this often misses the interlinking prophetic implications, that then prove Yeshua can be the only person who is Messiah by the numerous prophetic fulfillments at the 2nd temple destruction, and diaspora.
In my opinion.