Sounds like NASA wants money and time to study a non issue.
JMHO of course, but what they are really saying is they want more money to spend on robotic technolgy.
We are FAR more likely to encounter dangerous life forms that we have never seen before here on Earth than we are to encounter them on a mostly lifeless (and probably completely lifeless) Mars.
Spending money on a new type of containment facility would be a waste.