[ my investigation ]
Mr.Happy have right ... I've seen PyroVision in these files ... also there is a folder for the replacements : "RJ"
now we need to find how to ... i think they have really recompiled the maps with an specific entity in ...
i'll decompile Dustbowl to see if there is a strange entity, I'll let you know ...
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try to decompile cp_dustbowl. when u open it in hammer, it crash ... it do the same for all maps who have the PyroVision working ... without Doomsday
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however if u extract, for example Doomsday, rename it, then launch it, no pyrovisions textures are visibles ... there are normal textures ...
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i tried to rename Trade_Plaza into Sd_Doomsday ... then Textures Worked !
Demoman: SEE ??
Conclusion :
its really in a .TXT file where are the names of the maps who have these texture replacement ...
now we need to find where it is ...
[ I hope it helped you ]