Yes, they use Bing’s search index, but the relevant difference is that they promise not to retain logs of your searches associated with your IP address or other identifying data: https://duckduckgo.com/privacy
You keep posting this, but the official US inflation numbers do not claim 0.3% year-over-year food inflation (and have never claimed that at any point in the past several years):
"Lines of constant bearing" (or "rhumb lines") depend on the choice of poles.
A rhumb line relative to true north looks straight on a standard Mercator projection, but can look like a spiral on another Mercator-style projection where the pole and center-point have been swapped.
It sounds like it is dual-mode / transflective, based on the description of the button that “turns the display into an e-ink format” with ”a huge increase in battery life, up to 7 days of reading.”
No, the Consumer Price Index shows (seasonally-adjusted) inflation of 0.3% over the last month. The increase for the food category over the past year is 8× higher than that.