Sure, the African-origin hypothesis is plausible—IMO it was the obvious answer all along. But taking the Indonesian art as “reinforcement” of that hypothesis requires a bit of a logical leap.
Consider the two traditional hypotheses:
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Representational art originated in Africa with the ancestors of modern humans, and spread with their migrations; or
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Representational art originated where we find the earliest examples of it, and spread from there via cultural diffusion.
Hypothesis 2 was considered plausible as long as the earliest examples were from Europe. Finding earlier art in Indonesia doesn’t inherently support hypothesis 1 over hypothesis 2 unless you combine it with the assumption that cultural innovations spreading from Europe is more plausible than innovations spreading from Indonesia. But that assumption isn’t even addressed—it’s just silently taken for granted.
That’s my point: if 2 was never plausible in the first place, then changing the proposed origin from Europe to Indonesia doesn’t affect the likelihood one way or the other. Saying the Indonesian evidence supports the African hypothesis without explaining why is quietly letting the implied white supremacism off the hook without calling it out.