So all the same, are you worried or not because of this?

What do you propose to do? Panic and fan the hype about this event?
No one can influence the change of this occurred event (except for this whale). So maybe just relax and not worry about it?
I propose to look at this situation this way: if someone sells, then this is an opportunity for someone to buy.

Why are they selling now? Hmm, it's better to ask them themselves. We still can't find out, even if our guesses turn out to be accurate.
You're right but for the wrong reasons. Yes, we shouldn't be worried about that amount is not big enough to affect the market in any serious way.
But in general, if someone was to move a huge stash of bitcoins to the exchange, then a drop in the price would be expected. As such, it would make sense to take advantage of that, sell and buy back more at a cheaper price. Sounds like a better plan than relaxing and doing nothing.