The coincidences identified in this meme are largely accurate.
Prince Philip was 99 when he died, he died on April 9, and April 9 truly is the 99th day of the year. The claim that it was 9 a.m. when Philip passed is true in one respect (as the great Jimmy Buffet once said "it's
five nine o'clock somewhere") it was not 9 a.m. in London when Philip passed away.
While we do not know the official time of Philip's death, the BBC interrupted their regular programing shortly after noon to announce the news of Philip's death.
It should also be noted that the coincidences related to the number nine listed in this meme are only prevalent when viewed with a blind eye. For instance, one has to ignore the fact that April is the fourth month, not the ninth month, and that Philip died in the year 2021, not 1999 or 2099 or 9999.
While we have no idea what it means (and we're pretty sure it means nothing), it is true to say that Prince Philip died at the age of 99 on the 99th day of the year.