It just means that blocks, and consequently block-hashes, are widely distributed among a large community of completely independent entities. In this case, the community of Bitcoin nodes / Bitcoin users.
Any nodes that perform timestamping (mining) have to widely publish the hash in this way in order to be paid for their work.
What helps make the time-stamping immutable is 1) The size, distribution and relative anonymity of this community. 2) The use of a link to a previous block where the link takes the form of a hash of the previous block.

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