I am not very familiar with Juniper config, but this phrase summarizes it well. "This means we (AS13335) took the prefix received from Meta (AS32934), our peer, and then advertised it toward Lumen (AS3356), one of our upstream transit providers. " basically you should not receive a prefix from an eBGP session ( different AS) and advertize to an eBGP session. As they mention at the next steps, good use of communities could help avoiding it, in case of other misconfigurations.