Could RunAway still qualify
They could and, assuming LH wins 3-0 vs Meta Athena...
Runaway win 3-0 we get:
Lunatic-Hai 2-1-0 / 8–3–1 (+5),
RunAway 2-1-0 / 6–3–0 (+3),
MVP Space 2-1-0 / 6–5–1 (+1),
Meta Athena 0-3-0 / 0–9–0 (-9)
Runaway win 3-1 we get:
Lunatic-Hai 2-1-0 / 8–3–1 (+5),
RunAway 2-1-0 / 6–4–0 (+2),
MVP Space 2-1-0 / 7–5–1 (+2),
Meta Athena 0-3-0 / 0–9–0 (-9)
The question here is how APEX breaks this tie since they'd both have +2. The community seems to believe that Runaway would move on since they would have the heads up. Not exactly sure how this one would be handled
Basically they first need to win, not not give up more than a map while doing so.
Also, any win by LH will guarantee a top two spot since at worst they'd be 8-5-1 (+3), matching Runaway's best case scenario.
A loss by LH and a win by Runaway sees Runaway finish first and MVP Space finish 2nd.
If both LH and Runaway lose the former goes through because at worst LH would be 5-6-1 (-1) vs Runaway's 5-6-0 (-1) with LHhaving won the heads up.
If all three teams have the same map differential extra matches will be played. By the way I'm not sure what your issue with this is.
It's literally how APEX has operated at least since Season 2, and also how Contenders, TakeTV and the OWC work. This is nothing new but how would you resolve three way ties where each team beat another but with different map scores?