PaddingStatistics should be disabled when ExtraInfoStatistics is 0
The man page entry for PaddingStatistics says that it is disabled when ExtraInfoStatistics is 0. But that isn't the case: the statistics are published regardless of ExtraInfoStatistics.
As far as I can tell, PaddingStatistics are collected on bridges, but the man page says "Relays only."
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information