Using g://w to filter a buffer

Given the following description in the docs

"The global commands work by first scanning through the [range] lines and
marking each line where a match occurs (for a multi-line pattern, only the
start of the match matters).
In a second scan the [cmd] is executed for each marked line with its line
number prepended."

shouldn't this filter a buffer

"g/some pattern/w! >> some_file.txt"

to a new file, considering that

".w! >> some_file.txt"

works?

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