Is it true that all of these blood moons are prophetic events?

Those people don't understand astronomy.

They are prophetic of math and light if that is what you mean.

Up to this point, no eclipse has correctly predicted the end times.

Doesn't mean this one isn't the one. Could be that all the ones before this one were just to lull us all into a false sense of security, and then POW! Just wait and see.

The blood moon prophecies are a series of prophecies in the Bible preached by Christian preachers John Hagee and Mark Biltz, which state that a tetrad (a series of four consecutive lunar eclipses—coinciding on Jewish holidays—with six full moons in between, and no intervening partial lunar eclipses) which began with the April 2014 lunar eclipse is the beginning of the end times as described in the Bible in the Book of Joel, Acts 2:20, and Revelation 6:12. The tetrad ended with the lunar eclipse on September 27–28 2015.

https://en.wikipedia.org/wiki/Blood_moon_prophecy