I think this comes down to context - I do see you point and know that it has been asked several times but it completely depends on which part of each answer you take as finite.
e.g.
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That post you reference above argues it’s ok but a tthe same time you have another MOD there who disagrees.
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Likewise the FAQ gives the sword examples but if we’ve understood you right the premium features are not (to quote the FAQ) “if it was the starting weapon that even non-paying users could use”
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And finally - under regular license -“7.You can’t Sell the End Product, except to one client. (If you or your client want to Sell the End Product, you will need the Extended License.)”
It’s your choice at the end of the day and it seems unlikely you would get called out on it. I’d still suggest maybe asking support but based on those 3 points above we’d still say extended if it were our project.