These are just the few of the many that have lost their Bitcoins forever while there's just little to no chance for both of them to recover it, so we can conclude that they're totally lost forever. Should they give up or accepted that they're lost forever, these lost Bitcoins are like a donation to the community as its value retained on the market capitalization of Bitcoin.
Technologies are developing day after day, and recovering these coins may give a value greater than their actual value because they are proof, for example, of the device’s efficiency in searching for junk, or proof that data can be recovered from an old USB, even though I thought that the actual data lifespan for a USB is less than 10 years. If we assume that this USB is from 2011, we can consider that this data has already been lost.
It is impossible to say that these currencies have been lost, but they will definitely not have the same value as current currencies due to the additional costs of recovering them, and you may not succeed in doing that.
I think that preparing a multi-signature wallet is a better option, as we have had devastating natural disasters in recent years.