This is about the German government and their bitcoin investment, which shows how they had invested about 50,000 bitcoin and sold while the market was at $55,000.
You can see from when this decision was made in respect of their selling price to what the market price of bitcoin is today, they would have just made double of their selling rate as at then now, if they had hold to this time before selling.
More information on the chart from when they sold and rate to how it rises.
They sold at $55,000
The market is around $110,000
They missed out making 100% profits from the time they sold and rate to where the market is now.
The truth of the fact is that this story is no different from the famous story of Laszlo Hanyecz who paid 10,000 Bitcoin to buy just 2 ordinary Pizza, of which we are pretty sure the total value of the 2 pizza back then was less than $50, but yet Laszlo Hanyecz went ahead paying a whooping 10,000 Bitcoins, simply because he never thought Bitcoin will be this valuable today, and that's the exact scenario the German government could have thought when they sold their Bitcoin July last year (i.e Judging from the arrow in the chart above). And as such, inasmuch as you sell and later buy back Bitcoin, it's not a bad idea, unlike when you sell and never buys Bitcoin to invest again, because Bitcoin still has great potential to skyrocket with time.