I agree. Using this tool alone won't make you effective at using the shortcuts.
I think it is a good first step though ,for people like me, who use VIM on a regular basis with a fairly limited vocabulary of shortcuts. To actively learn new shortcuts, I usually need to write them down somewhere next to the computer and then keep referencing them (especially when they are ones I don't use very often so they take a bit longer to memorize). Something like this is great because it will at least drill the shortcut into my head, so that while it won't become habitual to use it (and I'll need to make an effort to make it so) at least I'll be able to mentally reference it when I need it without having to look it up.
I think it is a good first step though ,for people like me, who use VIM on a regular basis with a fairly limited vocabulary of shortcuts. To actively learn new shortcuts, I usually need to write them down somewhere next to the computer and then keep referencing them (especially when they are ones I don't use very often so they take a bit longer to memorize). Something like this is great because it will at least drill the shortcut into my head, so that while it won't become habitual to use it (and I'll need to make an effort to make it so) at least I'll be able to mentally reference it when I need it without having to look it up.