Questions posted in 2019, would typically have been for 2018 tax returns, not 2019 returns.
There was a major forum change in May-June 2019, so many of the questions with a May or June 2019 date were only moved from the old forum, on that date, and may actually be about tax returns prior to 2018 (under the old tax laws).
In general, you can not report prior year activity on the current year return. You must file an amended return.
