His wife developed symptoms first on the 27th, he fell ill later on the 28/9th March (Sat/Sun), he returned to work on Monday 13 April so just over two weeks isolation from first developing symptoms, the advice today is 10 days from first symptoms or positive test although I believe that was only recently raised from 7, which would've been what was in force at the time.
Nothing contrary to the guidance there.
There's a possible question about when his wife first became ill on 27 March however the initial symptoms at the time were not consistent with Corona so debatable either way.
Links:
Symptoms 28/9 March, penultimate paragraph of that section.
13 April return (and 27 March query)
IIRC the Scottish official visited a holiday home without good reason rather than make the journey to self-isolate away from his usual abode ( for reasons based on reasonable grounds), the first being a breach of the rules the second not being one.
This is perhaps more to the point however I would suggest it's not his actions that are at fault but the media's response to them.
Quite simply he followed the rules, but the BBC and others wanted his head for reasons unconnected to Covid, so they turned a minor matter that was at worst questionable into headline news for 10 days or more, so if anyone should go for the damage to public health you mention it is the journalists who created the story rather than the subject of it himself.