I don't like it. It does only seem like a Nuke Ops reskin to me. It sounds like it gives the Ops a chance for failure even after securing the disk, which doesn't sound fair to me since the major focal point of Nuke Ops is getting dat disk. Most of them will be dead by the time they do and if getting dat disk also means waiting longer for the biohazard to consume the station, that just means even more dead people waiting even longer for what's supposed to be a fast action-intense round getting dragged out. Just seems like it's "different" for the sake of being "different."
And I don't think "lore" makes sense either. I think a nuke is a lot easier to make and contain than a dangerous uncontrollable biohazard like a Blob or Terror Spiders. We have thousands of nukes today, I think future space-tech would have even less of a problem pumping them out. Plus, the Syndicate doesn't need to be subtle so "Nanotrasen can't retaliate," it's already a shadowy cabal of many factions and organizations united by a hatred of NT, it's not just one group, it's many working in cooperation. It's hard to tell who does what when you're NT because everyone hates you so it could be any one of them. If the Syndicate wants a station destroyed, they'll do it in the most practical and overt way possible, i.e. a nuke. And space suits can already function like biosuits, can't they? No reason for them to wear something else in that case, as cool as the visual could be.
Some other servers, tgstation for example, already give Ops a biohazard option in that they can buy and release dangerous and infectious diseases onto the station to weaken and distract the crew while they attack. If you want biological warfare, I'd say you should instead go for something like that, an option that is merely a means to an end.