Here is my interpretation of Cloudflare's statements (and lack thereof) in their transparency report:
"We received 0-249 National Security Letters" = "We are subject to one or more National Security Letters with associated gag orders."
"Cloudflare has never installed any law enforcement software or equipment anywhere on our network." = "Someone other than us installed law enforcement software and equipment on our network, or we provide software interfaces used by law enforcement to comply with an NSL."
"Cloudflare has never turned over our encryption or authentication keys or our customers' encryption or authentication keys to anyone." = "Law enforcement may MitM Cloudflare customers' websites through first-party interfaces provided to comply with NSLs."
"Cloudflare has never weakened, compromised, or subverted any of its encryption at the request of law enforcement or another third party." = "Law enforcement may MitM Cloudflare customers' websites through first-party interfaces provided to comply with NSLs."
"We received 0-249 National Security Letters" = "We are subject to one or more National Security Letters with associated gag orders."
"Cloudflare has never installed any law enforcement software or equipment anywhere on our network." = "Someone other than us installed law enforcement software and equipment on our network, or we provide software interfaces used by law enforcement to comply with an NSL."
"Cloudflare has never turned over our encryption or authentication keys or our customers' encryption or authentication keys to anyone." = "Law enforcement may MitM Cloudflare customers' websites through first-party interfaces provided to comply with NSLs."
"Cloudflare has never weakened, compromised, or subverted any of its encryption at the request of law enforcement or another third party." = "Law enforcement may MitM Cloudflare customers' websites through first-party interfaces provided to comply with NSLs."