Document matching under the Automated Underreporter program won't even start until after the extended October 15 deadline.  You won't see CP-2000 notices for 2019 until April, even if they follow their usual schedule (which is doubtful).  Most of them come out more than a year after most returns are filed.  If IRS had the technology to compile W-2s and 1099s, most taxpayers wouldn't need to file a return (that's how they do it in countries like Great Britain and Estonia, which aren't dealing with a third-world tax collection system).