I don't know how factual your claims about their Hodlings are but what I'm sure of is that with that huge a percentage of the total bitcoins in circulation they have as hodlings , they can definitely affect price but for a limited time. The problem is FOMO in the market will increase the induced change in momentum if they make news of wanting to sell off.

However the good news is because of the adoption strength of bitcoin it would fade off eventually but on a general basis it also depends on how the market reacts to it.