Hate to tell you bro, the statement actually means that he should not have been arrested as he was not taking part in the protest. Its more of a statement to fight the authorities on a technicality. Its seems to support Yap who posted the same things after his release - that he should not have been arrested.
If SDP wanted to make it crystal clear, they would have done a statement like so
" My Yap Keng Hor is not a member of the SDP, not considered to be supporter that follows in the main the SDP approach to politics and SDP do not want to be associated with this individual."
In fact the statement tells me that iinteresting tactics are being used. I suspect the difference surfaced only recently. The comment on Chee/SDP being soft as mentioned by Yap in his post in this forum
UY left out mentioning and giving credits to the F4...no wonder:p