Standing in front of the US capitol building for about an hour is also about 0.1 uSv. Granite is quite radioactive, you know. Some kitchen countertops are much worse.
0.1 uSv is also the generally accepted as the "banana equivalent dose". Bananas are a decent source of potassium, which aside from being an essential element is also somewhat radioactive.
There is no fixed accepted dose rate for flying. More than a couple and less than a dozen uSv/hr is about as accurate as you're gonna get. Depends on flight path and altitude and who knows what all else. The claim that its a couple minutes of flight is not all that far from the truth, more or less.
People who don't really understand what they're afraid of can't rationally minimize risks anyway. Perhaps the granite in a kitchen countertop or architectural decorative feature would increase cancer death rate by 0.0001% but cancer due to chemical catalyst contamination in a replacement laminate countertop MIGHT be ten times the cancer death rate of radioactive granite. Or maybe not.
Assuming they're telling the truth about the dose, I wouldn't worry about the radiation dose. Its small enough to be measured but biologically irrelevant.
What is highly suspicious is a police state violating constitutional amendments probably isn't very concerned with citizen health and probably feels no need to tell the truth. I could see some PR guy claiming its only 1 banana-equivalent-dose or an hour sitting at a granite countertop or whatever because he knows its irrelevant, even if the actual dose is so high that passersby hair is falling out and they're getting radiation burns because its an enormously higher dose. I mean, the government would never lie to us, would they?