I don't think IPX fronts for a bioweapons firm, but for Earth Force's bioweapons research division. Basically, they've found biological technology on Mars, but have had trouble understanding it, and IPX is a useful front for acquiring more examples of the same, or similar, technology for further research. They are mostly doing what they claim, just not for the exact reasons they claim.

As such many of the scientists working for them might not notice the lies, especially if they spend most of their time digging stuff up or 'poking it with sticks' in laboratories. And especially if they don't find any shadow tech or other organic tech themselves. They just do their jobs, and what IPX does with it afterwards isn't their business.