Also, regarding point 1 -- and I'm sure you know this already, but this is for everyone else -- you have to be careful when talking about "Logic Elements" with most of the industry because, even when describing 6-LUT parts, Intel/Xilinx often list "Logic Element Count" to mean "Number of logic elements when considered on a normalized 4-LUT basis." Both Intel and Xilinx do this and I guess it kind of makes sense; only their highest end parts are non-4LUTs so they're the odd ones out when compared to everything else in the industry. So when you read "Number of LEs", they normalize it to 4-LUTs since that's what your competitors (or older parts) would use, when accounting for density.

For example I have a Stratix 10 card in my server that has "Millions of logic elements" when you look at the product tables, but that is taken on a normalized 4-LUT basis. There are actually "only" about 900,000 ALMs on the device, with each ALM being 8-input and fracturable. So TL;DR the numbers between the low-end Agilex-D part and the Cyclone part is maybe not that far off.