It is not. Intel gave away the TB3 standard to the USB IF who made USB 4 out of it and that is the way of the future. It came out in '19 August, the differences

It is not. Intel gave away the TB3 standard to the USB IF who made USB 4 out of it and that is the way of the future. It came out in '19 August, the differences are small but important: where the TB3 bus only carried PCI Express and DisplayPort signals the USB 4 Gen 3 bus also carries USB signals. Previously the USB ports on a TB3 dock / enclosure were implemented using the hotplug USB root hub in the TB3 controller in the TB3 device and it often resulted in a less than satisfactory experience (in other words, it sucked so badly some manufacturers used two TB3 controllers to make it better). TB3 enclosures will be usable by USB 4 hosts.