Yes especially since they're using the hacked account's NX to buy it.
Still, most people with +15s are smart enough to unbind and bind the weapon until it's locked to their main, but the hacker can still NPC or drop it.
Just so you know in the past whether the crimson blade security code in effect or not, you better hope you aren't keylogged. If someone has a good enough one, which i've researched before, they're also capable of taking screenshots at high fps. So You better hope you have you have good antivirus software etc.