Not seeming to find misspelled words

[cfjedimaster]

I'm using a Markdown file with this in the first paragraph:

As you can tell, I'm on somewhatxssdsddssd of an Alexa thing lately (["Adding Ice Bear to Alexa, Because Why Not?"](https://www.raymondcamden.com/2018/11/28/adding-ice-bear-to-alexa-because-why-not)), mainly because now I've gotten it to a point where I can deploy an (admittedly simple) skill in
 about thirty minutes. Also, certification seems to have gotten quite a bit simpler too. That could also be
 tied to me building incredibly simple skills but I'm not going to complain. For today's <strike>waste of
 time</strike>incredibly useful Alexa example, I've built a little skill for the sole purpose of messing with
 my kids during this wonderful Christmas season.

And the misspelled word in the first sentence is not being picked up. I'm using this in my .textlintrc:

{
  "filters": {},
  "rules": {
    "no-start-duplicated-conjunction":true,
    "no-dead-link":true,
    "terminology":true,
    "@textlint-rule/no-unmatched-pair": true,
    "alex":true,
    "spellchecker":true
  }
}

Any idea what I'm missing?