Is it an encouraging poll for yes? Of course it is.
However I think it needs to be treated with a bit of caution. It's still within the margin of error of previous yougov polls and whilst there is a pro-yes swing, it would still leave them with a sizeable 8% swing to make up between now and September. Doable? Yes, but far from easy.
I hardly think celebrating a 16 point lead is "clutching at straws", the bottom line is this poll doesn't tell us all that much we didn't already know imo