In June 2026, Google launched a massive enforcement wave targeting three critical areas: the newly defined 'back button hijacking' spam tactic, the imperative shift toward multimodal SEO as visual search dominates queries, and strict EU AI Act compliance for generative content. This article dissects these changes, offering actionable strategies for website penalty recovery and optimization. We conduct a rigorous head-to-head comparison of seven leading SEO audit tools—including Screaming Frog, Semrush, Ahrefs, Sitebulb, Lighthouse, Google Search Console, and SilkGeo—evaluating their ability to detect these specific 2026 vulnerabilities. Discover which tool offers the best AI diagnosis, GEO optimization capabilities, and anti-detection features to protect your rankings in this volatile landscape.