In the previous post, I argued that artefacts do not exist in a "metaphysically serious way". The notion of metaphysically serious existence is a foggy one. But I think I can give two sufficient conditions for it. The trivial one is that Fs don't exist in a metaphysically serious way if there just are no Fs. The non-trivial one is that Fs don't exist in a metaphysically serious way provided that whenever "x" is the name of an existent F, the proposition that x exists is a proposition that holds in virtue of the truth of some proposition that does not make reference to the x.
For instance, if x is a particular hole in a wall, the claim "x exists" holds in virtue of a proposition reporting a certain area's being surrounded by the wall but not itself containing any parts of the wall. Likewise, if x is a waltz that George and Sally are dancing, then the claim "x exists" holds in virtue of George and Sally waltzing at a certain time in a certain way (the "certain" encode the amount of precision to ensure that we're talking of this waltz rather than another waltz). Thus, holes and waltzes don't exist in a metaphysically serious way.
Note that the "in virtue of" relation here is more than just "being entailed by."
On my view claims like "This table exists" may be true in virtue of facts about arrangements of particles and/or fields as well as the intentions and/or practices of agents and/or communities. Or, alternately, such claims are false as they stand, but they are close approximations to true claims which hold in virtue of facts about arrangements of particles and/or fields as well as the intentions and/or practices of agents and/or communities.
