I don't really know that they'll be obsolete. Even once they get fixed, venom stacking should still be legitimate.
Oh hey, I got curious about how the bug was behaving, so I made a graph of what's happening, and it's scaling exactly how it's described to in
@Zoidberg747 's Venomous guide. If this is a bug, it's been in for a good long while and no one ever cared because there wasn't really a practical way to get stacks that high.
Venom ticks being explained in May:
This is exactly what's happening now. Each additional application of venom increases the initial damage by another .5% until the 5 second timer is up. After looking into it like this, I'm not sure this is a bug so much as NRS not realizing just how high the Venom mechanic could scale.