Around 55 seconds you see the impact, it's a relatively small explosion. A Tochka or any ballistic missile would absolutely wreck that ship if it managed to hit it.
Unless they were claiming it was a lucky shot from a ballistic missile fired from hundreds of miles away. And you didn't want to embarrass your friend that just provided you with missiles that the Russians wouldn't be too happy to know.
From the shore, on the other side of the dock in the video I assume.
Watch the video again. You can see what looks like an side impact, and then the bigger fire when it spreads. If it was purely because of munitions exploding, why such a big explosion outside the ship? Not impossible, but a missile strike is the far simpler explanation.
You're comparing a 500kg warhead to one that's less than 50kg. Also a ship has armour. The missile hit the ship which caused a fire, which then spread to munitions. The Russians are lucky not to lose the ship completely. I bet they lost quite a few men.
You might want to look closely at 25s mark. That’s when the first explosion happened and it’s small one.
You're right. The first one doesn't look smaller but lower down and more obscured by the pier. Maybe two missiles hit?