Yes, those are great
Just one small thing: in 0.91, it's not necessary to ungroup/combine before using bend path effect. It works on groups, too (unlike the PAP effect). Or was there another reason for the ungrouping/combining?
Although they're fairly comprehensive, the tutorials are just meant to give a broad overview of using Inkscape, rather than covering every single detail. In the case of LPEs it seemed easier to describe the method that works with all the LPEs, rather than having to specify which ones work with groups and which ones don't. In the previous instalment I described LPEs as basically being a function that takes a path as an input and produces a path as an output. Although that's not strictly correct (as you mention, the input can also, sometimes, be a group of paths), it's a good enough working definition that I didn't want to confuse things any further.
But it's great that you've read the article enough to pick me up on things like that - I'd rather have people ask questions, as it helps other people (and me!) to learn even more.