Becausefrom what I've read on forums, by all accounts from the insiders, the technology behind 18A is incredible (gate all around transistors, backside power delivery, 3d Chip stacking...) and that in a year or two ,it should put Intel manufacturing a little ahead of TSMC.
Although, have also read that the one problem is that even 18A won't be profitable for a couple years. Yeah, that the problem with Gelsinger's original plan is that 3 years wasn't enough time to get to profitability, but 5-8 (but that it still is a good plan).