It's not just that she's ISU lore - Central Iowa is literally her adopted home. She's an Australian native who came here knowing no one and remains close to her host family. His family is in Milwaukee on top of that. His HS recruiting is almost exclusively based out of Milwaukee, Chicago, Minneapolis, and Kansas City, and even a large chunk of his portal targets are Midwest natives looking to get closer to home.
Obviously Texas has way more money than ISU, and more in-state talent, but I just have a hard time seeing him leaving period at this point, especially for a job where basketball takes such a back seat in a part of the country he doesn't have many/any HS recruiting connections, so far away from both he and his wife's respective homes.
It's a lot different situation than Hoiberg. Hoiberg and his wife both grew up in Ames and they felt smothered by the hometown hero/everyone knows their family/knows their business type of thing that can accompany life in a provincial smaller college town. Hoiberg ultimately felt trapped by his legacy as The Mayor and wanted out of the fishbowl. Otz and his wife both chose this place to put their roots down and build their life. This is his third stint at ISU (twice as an assistant). He's extremely invested here.
Doesn't mean he'd never leave, but I just don't see a job like Texas being the one he'd leave for. Not that Texas isn't/can't be a great job, it just doesn't seem like a good fit for him. Frankly, I'd be more concerned about Wisconsin than Texas.