For massive sites, leverage Indexing APIs for automated, high-volume...

https://seo.edu.rs/blog/why-your-indexing-tool-says-indexed-but-gsc-says-otherwise-11102

For massive sites, leverage Indexing APIs for automated, high-volume submissions. For niche link-building campaigns, manual submission or specialized tools—often verifying status in under two minutes—work best. Avoid relying solely on these tools, however