I can't be sure, but think the doubt is wrt the way you selected and then 'interpreted' what those figures 'mean' or imply whilst ignoring other relevant points.
Start with the fact that the SNP gained and now have many seats, elected on an explicit platform that this would give them a mandate to press for and have another IndyRef.
It is reasonable to accept that not every SNP voter actually wanted that.
However it is also reasonable to accept that not every *non-SNP* voter did *not* want that.
Hence the mandate isn't for independence. It is for the Scottish Goverment and the SNP at Westminster, to seek another IndyRef. Just as other elections produce a large party majority from a minority of votes.
Add in the warning last time around that voting for Independence would eject Scotland from the EU, and then the size of the difference in Yes/No votes, and it is also clear that circumstances have changed materially. At the time of the last IndyRef we could expect to remain in the EU having rejected Scots Independence and thus avoid being ejected by voting to leave the UK. That certainly swayed some voters.
Hence it is now appropriate for the SNP to seek another IndyRef.
I have no idea when this might occur. Nor how I'd vote. But it seems reasonable for it now to be sought, and then held.
If you are confident that Scotland is better off within the UK, then you can make that argument. Consider the title of this topic thread.