9
Arianespace Pushes First Ariane 64 Flight Back to 2026 - European Spaceflight
(europeanspaceflight.com)
did not offer any explanation for the delay
I mean, the turnaround days so far, assuming 4 Nov and 31 Dec for the next two: 240, 160, 83, 57. It's pretty reasonable to not ramp up enough to squeeze in a 5th launch this year.
Next year has 10 launches on Wikipedia (only counting 1x Kuiper), so they'll be busy. The Ariane record was 12 a few times around 2000, but I bet that'll stand for at least 1 more year.