Do you guys realize how stupid those comments really are...Over at your playground???
There are many things wrong but I will cover just the major ones.
Assuming that the J-20's low radar observability is mainly from shaping, then absorber will be confined to a minimum where direct specular reflections will be dominant, such as leading edges. That mean walking on the surfaces will be acceptable because there will no absorber in those areas. This is applicable to the F-22 as well. Second, just because it is acceptable to walk on them, that does not mean we should because of the potential danger of gouging the surfaces with our footwear. That is why for the USAF, maintainers don 'booties' to cover up their combat boots prior to getting on the aircraft. For the J-20, assuming the same body shaping principles as primary for low radar observability, the Chinese maintainers will most likely have the same protocols for themselves.
So do tell whoever is 'Daokou' whether it is a person or an organization that said comment is based upon sheer ignorance. And you guys actually 'thanked' that as 'useful' over there?