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I’ve seen hacked sites recover, but usually way slower than people expect. If Google saw 70k junk pages, trust probably got wrecked at the crawl/index level, not just rankings. The fact you’re still getting impressions is at least a decent sign though.
Personally I’d look hard at crawl stats, indexing patterns, and whether Google is actually revisiting the new content properly. Sometimes the site is “clean” but still treated like low-quality/generated spam for months after.
