To be fair they measure them differently.

For reference, Intel 10nm has slightly higher transistor density than 7nm TSMC or Samsung

https://www.techcenturion.com/7nm-10nm-14nm-fabrication

Table after the chart says TSMC's 7nm+, currently in mass production, has higher density than Intel's upcoming 10nm.

TSMC’s 7nm+ 115.8 MTr/mm²

Intel’s 10nm 100.8 MTr/mm² (2018 estimate)

It is completely insane (and awesome) that "Million transistors per square millimeter" is a useful unit.