Yes, they mention taking over tsconfig management because even generated .d.ts files are sensitive to tsconfig - article mentions type being different depending on the tsconfig setting.
But in general publishing the most strict ts should work fine when using from weaker tsconfig.
Personally I don't use custom path resolutions, can't comment on that.
ps. oh wait, but why does it matter? .d.ts file won't be different if you change strictness in tsconfig - why would it make difference for published .ts files?