As pointed out by the interviewer, Murray's stance on IndyRef2 is a little hypocritical given that he is such a vociferous supporter of a second EU referendum. Murray is also a signatory to the latest legal action to stop Boris Johnson proroguing Parliament.
In 2014 Scots rejected independence by a 10% margin, more than twice that of the UK's Leave mandate. Both these votes were 'once in a generation' referenda and should be put to bed. However, the national Labour party is eyeing up coalition partners should there be a general election and will happily accommodate SNP demands for IndyRef2 as part of the bargain. Richard Leonard, Ian Murray and co won't be happy about that.