Part of the blog says : "In this time, we’ve converted 19 of our data centers to this architecture, internally called Multi-Colo PoP (MCP): Amsterdam, Atlanta,

Part of the blog says : "In this time, we’ve converted 19 of our data centers to this architecture, internally called Multi-Colo PoP (MCP): Amsterdam, Atlanta, Ashburn, Chicago, Frankfurt, London, Los Angeles, Madrid, Manchester, Miami, Milan, Mumbai, Newark, Osaka, São Paulo, San Jose, Singapore, Sydney, Tokyo." Is the term MCP synonymous with "tier 1 PoPs" (mentioned elsewhere in other cloudflare blogs from time to time) or are the two terms referring to different things?