This was won on a technicality, not the merits of your argument or you parking on a SYL and mistakenly believing that a No Stopping sign had any relevance.
Your error was trumped by theirs in presenting inadequate evidence. There is no suggestion in the decision that the absence of a stand-alone No Waiting sign at the location had any bearing on matters.
I have just had a look at yesterday's tribunal decisions and I was overwhelmed by the proportion of Refusals.
Taking a case to adjudication on arguments based in emotion/frustration/annoyance etc... is a gamble which, with current penalty levels, could prove to be expensive.