You should better point to the official site than promote a suspicious third-party one. It contains incorrect information on the license, maybe some other mistakes.
I'd better read something on the inode uniqueness problem than this. I've already got in trouble with GNU tar because of duplicated file identifiers in overlayed FS.
It is possible to boot from a single partition, USB live images work this way. But regular installation that OP wants to clone likely has a separate partition.
One partition is not enough. You also need to copy a EFI boot partition and create a correct partition table manually. And note that you cannot get a correct result when partitions you are copying are mounted. You need to boot some live system to do this.
You should better point to the official site than promote a suspicious third-party one. It contains incorrect information on the license, maybe some other mistakes.