I think they are talking about the difference between SSD and HDD, because the most part of SSD are still using SATA interface in our computers, and only NVMe disks use PCI-Express instead of SATA.
But it will not help me to answer to your question because performance are not the same between SSD disks. It depend on the memory used (MLC, NAND, V-NAND), the storage size and the price. Some low prices SSD are probably 10x slower than midrange SSD.
I can only confirm that SSD provide better latency in read/write access with higher transfers speed than HDD.