Yup. Like they said, it's a mini-mash or partial mash. When I finally realized that keeping my steeping grains at a more targeted temp (and pH), it was a big time "aha!" moment for me (pun intented).
The ability to add non-steepable grains is huge. With that comes the ability to mash adjuncts.
That's when you have to start paying attention to diastatic power. Most full AG batches have no problems with DP,
but you can hit DP limits quickly doing mini-mashes. I'm not trying to scare or dissuade you at all, I'm just letting you know that
this is getting more advanced, so with it there are more things to take into account when you build a recipe that you didn't have to
Keep going! It opens up so many worlds for you you will be amazed!
If you have questions, just ask. People here will always help.
[edit - changed "steep adjuncts" to "mash adjuncts" above for correctness]