Thanks for the comments. The July update solves the issue highlighted.
Fantastic to see Microsoft responding so quickly 😉 anyone like anything else solving for tomorrow? ha ha.
On a semi-serious point. The article was written well before the update & in response to anumber of comments in the internet where users were having issues with columnnaming restrictions. It’s great to seeMS listening to its user base and continuing to improve Power BI with each release . Thanks!