You are confusing perfection of structure with chemical purity. Pure semiconductors have high resistance because the band gap suppresses intrinsic carriers. The intrinsic carrier concentration has to be low for most devices to work properly. This allows you to make some parts n-type and other parts p-type by doping the material with impurities (electron donors or acceptors). Higher carrier concentrations bring lower resistance.

Polysilicon in this article is silicon that has been purified from the original mineral source (ie quartz). It is 100% silicon (actually some number of 9's). This is what you would throw into your reactor to grow ingots of single crystal silicon to slice up for wafers. But the purity is already there in the polysilicon. Depending on the purpose, the wafers will probably be doped (reducing purity) to make them n-type or p-type.

You can also deposit polysilicon on wafers for gate metal during IC manufacturing. Imperfections in the crystal decrease the mobility of carriers because the great quantum dance is interrupted by misplaced atoms and grain boundaries. So at the same carrier concentration, polysilicon has higher resistance than single crystal. But without the impurities that generate carriers, the resistance will be high. So gate metal polysilicon is also doped to get the resistance to a useful point.

In the 90s I was constantly responding to their mail offers to get install diskettes for personal use. Much cheaper than buying them for a poor student. Those AOL signup ads were in every print media. And they apparently didn't check how many they sent to the same address. I was sad when they upgraded to CDs because I lost my supply of free floppy discs.

You can afford a home period. I live inward of Anna, TX. When I bought my house in McKinney 20 years ago it was out in the boonies and therefore affordable. Now you can't get a house for less than $400k. So you look 10 more miles out of town. Remote work is not required. People drive from Anna to Dallas to work all the time. And the main traffic artery is jammed for hours because of it.

I got my copy of "The AWK Programming Language" at Half Price Books. It's got code to implement a relational database in AWK if you need joins. And AWK code should run in perl with minimal fuss.