I thought the tariffs were about eliminating the IRS, not the border?

For reference, this was a few days ago: https://www.foxbusiness.com/media/trump-proposes-abolishment-federal-income-tax-bringing-us-back-richest-period-history

I'm a little lost. The selling point on tariffs was that these would STAY in place as a means to get rid of federal income tax. Trump himself said this. THe plan was to establish an ERS and then consequentially eliminate the IRS and use these tariffs to replace income taxes.

So what happened? Why is he already renegging?