Sounds like good advice for everyone traveling to countries that scan/copy your devices on entry.
On entry to any country, I sync my devices and wipe them.
https://www.theusconstitution.org/litigation/merchant-v-mayo... https://www.eff.org/deeplinks/2021/10/come-back-warrant-cong...
This really is a shameful state of affairs that Congress should fix, but I’m not holding my breath.
Is it the case that device-level encryption successfully prevents access to the contents, or is that a layer I should refuse to trust?
The best thing you can do is bring a wiped device through, and assume that it and its data can be seized at any time. Also treat any device as disposable - once seized, it should not be trusted.