Strong work Sir
"YamahaR3" raises good points of concern, so let me add a couple of comments:
I was also concerned about the paint scuffing issue when I tied stuff down in this way on my previous bike (a 2007 Honda cbr600rr ). I think the keys to avoiding scuffed paint would be:
1) Be very careful while tying and untying the goods. Don't allow the straps or bungy cord to slide hard against your fairing plastic. If it isn't moving, it isn't likely to scuff.
2) It may be advisable, particularly on this bike's tail's angular corner section, to put some clear adhesive plastic above the anchors, over the angular section. This is the location likely to scuff and some clear adhesive plastic will protect the area with minimal aesthetic disturbance.
On the topic of the secureness of the method, I have found from experience over many years, that this depends on the size, shape and weight of the cargo and the type and tension of the cord used. For the shoe-box (with shoes inside) and bungy cord example photographed, trust me, I could ride for a year on corrugated gravel and that box would never come off. However, if you were to try and lash down a large heavy suitcase on the R3's convex rear seat, you are being foolish.
Bottom line: I think this little mod is useful for certain applications where the goods are judged suitable and safe to tie down in this way .