I’ve been in a few situations before where it’s been incredibly tempting to just not show up because:

• Your management doesn’t value your input
• Nepotism is prevalent when promotions come around
• You’re not doing the type of work that was advertised in the job post and discussed your first two weeks
• You’re doing excellent work solving difficult and/or outstanding problems but someone else gets the credit

Sure, you could put in a notice of resignation, but if you know that your manager is going to harass you for reasons why, possibly belittle you, and try to guilt-trip you into giving more time to the company to “finish out” tasks on your queue that they’ve not bothered to train anyone else on that you’ve requested over the last two years, then wanting to cut ties as quickly as possible given the toxic environment is a fairly normal desire.

Not saying it’s the right thing to do, and all the flight-hopping that OP claims does seem a tad strange, but sometimes people end up in a fairly unsupportive or toxic environment where you just have to take actions in putting as much distance and as many barriers in place as possible to mentally feel like you’ve regained some level of control.