This sounds as if walking on the moon led to some symptoms. But if you know Chris Hadfield, he said "space has a rusty burn smell" even elsewhere. How can they

This sounds as if walking on the moon led to some symptoms. But if you know Chris Hadfield, he said "space has a rusty burn smell" even elsewhere. How can they conclude that moonwalking specifically led to what was described? The article has "The toxic side of the Moon", but IMO it would be more reasonable to assume that space in general is toxic, not "only" the moon. It also means that the space suits are not well-equipped - people in 50 years from now will shake their heads about that, how naive we may have been.