No, a vacuum seal is completely different to an anti-tamper device. You cannot look at a tin and say there is no seal or vacuum. Indeed even by opening a tin you cannot say categorically there was no vacuum seal as a tin can be vacuum sealed but still have a lid that comes off relatively easily. But with a security seal around it, you can certainly say that no one else has opened that tin from when it was done in the factory to when the end customer opens it to smoke the tobacco.
In the future there will no doubt be more requirements placed on tobacco products with regard to security. There are certainly other security seals being talked about.
The heat seal is to show no one has tampered with the product before it reaches the end consumer.
"But honestly, this seems shady, like you know there's a problem, but aren't owning up to it.............."
We were made aware of a problem with the old style tins not always sealing well, mostly after long shipping or storage situations and so went about re-designing and sourcing new tins. This is hardly "not owning up to" a problem. And on numerous forums in numerous threads I have addressed the issue. Again this is hardly being shady and not owning up to a problem. We noted the problem and responded with a new tin design. And as part of ongoing improvements, and due to some concerns by some customers that tins may have been tampered with before they reached the end consumer, we have opted to heat seal all tins with a plastic wrapper so that there is an anti-tampering device as well.