It appears that this is from a Japanese staffer’s blog/update and not directly from Taeyang himself. It is called “A Day in the life of SOL-01 &02” but again, it is not a diary/blog from Taeyang.
“Sky and SOL”
Volume 3 :
*Taeyang is riding a”Hummer Folding Bike“*
Source: @YB_518, @kiyonnnn and @ZGV3aQ (for Volume 3 and Hummer bike info/link)