@Achalugo BTC, your topic title is completely off-topic to what you posted. Post-quantum world means a world after quantum computers, like quantum computers to become archaic or obsolete.
I don't suppose that the current quantum computers posses the capability to actually perform such a complex calculation yet. It'll only take a sufficiently powerful quantum computer to potentially use Shor's algorithm to factor the public key and derive the private keys of a cold wallet, and such quantum power hasn't been implemented yet, so using a cold wallet could still appear to be a safe way of storing Bitcoin in a post quantum world. Except I'm wrong...
You're right, the current quantum computers might not really possess the required coherence and power to perform such complex calculations that it takes to break through the cryptography of Bitcoin using the Shor's algorithm. So except a more powerful quantum computer with sufficient power is developed, using a cold wallet remains a safe storage option.
Yes, cold storage is safe as long as quantum computers are not yet able to brute force bitcoin private key from public key, but what Tungbulu posted is off-topic. Probably he did not read what the OP posted but likely just skimmed or scanned through it.
And do you mind telling me what aspect of my response is off topic or shows that I didn't properly read the who thread? The first correction you made or should I say attempted to make later appeared to be inaccurate and off topic.
Firstly, you coumtered my view and said even cold wallets wasn't safe, and then you coming now to reverse your statement because @Ever-young seconded the same point I made earlier which you initially countered, are you sure you don't have a personal beef with me?

Now you still claimed that the OP's title is totally off topic which doesn't seem so now, judging from the quote below. Be like your own here Na to dey wetin dey off topic when Na you dey even dey talk off topic here... I mean no disrespect sir, before them go talk say Tungbulu no get respect

@Achalugo BTC, your topic title is completely off-topic to what you posted. Post-quantum world means a world after quantum computers, like quantum computers to become archaic or obsolete.

According to the above image, I'm pretty sure the subject suits perfectly well and is on topic with the contents of the thread. Except I'm the one misunderstanding what you're trying to say here Sir.