They changed their branding. Their 10nm node was renamed to Intel 7, their 7nm is now Intel 4. Since amount of nanometers doesn't really mean anything anymore that's good PR strategy that nicely represents state of their nodes because density on Intel 7 and TSMC 7nm is pretty similar anyway.
I believe Intel didn't strictly rename Intel 10nm to Intel 7, it's a refinement of Intel 10nm that is Intel 7 (they were previously calling it 10nm+ if I recall correctly).
Shouldn't it be 10nm-? :)
Intel rebranded their x nm to be TSMC's y nm. This may seem a bit subversive but it's not ridiculously unreasonable as the nanometre figures are complete bullshit, and the density measures are also sufficiently synthetic as to be mostly useless when comparing a similar node anyway (i.e. there's more to it than just shoving transistors on a chip)
There are very interesting ways that we could compare architectures, but it would never get past the marketing department and it might reveal capabilities that they would rather have a secret, so we are stuck with a single meaningless number.
They renamed their other nodes to cover those (and to better align with the rest of the industry).