That’s just marketing fluff in terms of measurements. Most agree that in terms of gate size, intel’s 7nm is similar to TSMCs 5nm. So you could say that Intel moving to 5 would give them a 30% boost but the TSMC goes to 3nm.
Intel renamed their nodes, "Intel 7nm" is what they were previously called "Intel 10nm". So the node numbers are now (semi) compatible between Intel and TSMC.
To be clear, the node formerly known as Intel 10nm is now called Intel 7. There's no unit attached, which is probably for the best, as what was being measured in nanometers previously was super subjective and varied per manufacturer.