I'm well aware. That's what I allude to in the first response you quote.
Handle contingent elections.
Certify the vote tallies and designate electors. In general, they define election law in their state.
...individuals can pursue litigation. State legislatures in particular can deny certification, and can pass measures to reclaim the necessary powers to personally designate electors.
That noose is getting to your brain.
They handle contingent elections. There will not be a contingent election if the SCOTUS does not rule in your favor - and if the SCOTUS does rule in your favor, then 2020 already deviates from 2016 in a relevant manner: 4 states would have their results overturned, in essence.
All 50 states have already certified their vote, regardless of the legislators who dissent. You need to compel them to decertify, which is either the SCOTUS or GA's investigative committee right now. If the states attempt to deviate in sending electors, this triggers a constitutional crisis. Somehow, all these states that have certified are just going to pass legislative bills to decertify? Riiight.
We are within the safe harbor. Individuals cannot pursue litigation, and the states at current effectively need to be compelled to decertify. Anything that came before safe harbor fell, provided there are no challenges to the wording of safe harbor, might be able to compel them - again, SCOTUS and GA.
You're 0-40 for lawsuits and 0-50 for denial of certification. You've got two hopes that there is any contest which sets this apart from 2016 - and one of which still leaves Biden in the seat.
Is the SCOTUS even allowed to postpone the EC convention?
Open question, actually. People are kindof just assuming that it can - or that it can force certain states to delay on the selection of their electors and have them vote at different times.
If we assume that they are able to issue a stay regardless of safe harbor, (3 U.S. Code § 5), then the wording of 3 U.S. Code § 2. becomes relevant:
"Whenever any State has held an election for the purpose of choosing electors, and has failed to make a choice on the day prescribed by law, the electors may be appointed on a subsequent day in such a manner as the legislature of such State may direct."
Throwing out the 'choice' that was made by the election at the time means that they can be appointed on a subsequent day, and presumably that those voters would be vacant.
And that vacancy is 3 U.S. Code § 4.: "Each State may, by law, provide for the filling of any vacancies which may occur in its college of electors when such college meets to give its electoral vote."
Problem is, the date is specific - 3 U.S. Code § 7.: "The electors of President and Vice President of each State shall meet and give their votes on the first Monday after the second Wednesday in December next following their appointment at such place in each State as the legislature of such State shall direct."
So there's a few probable reads - either a stay is issued and it is somehow invented that the EC meets later (very unlikely imo), or the court rescinds all of the electors in time for the legislatures to re-appoint electors, or the court doesn't do anything and sits on the case/rejects it, the deadline falls, and the states send their electors out as normal.