Framing corrected first: the “55 chains / 50+ repositories” here is a count of report targets/repositories, not 55 production mainnets; it mixes mainnets, prototypes, testnets, unaudited and already-excluded projects. The targets actually named by section are as follows.

Privacy / UTXO: Conceal, Zano, Dero, Beldex, Epic, Pirate, Nerva, Wownero, Firo, Tari, Verge, Beam, Grin.
L1 / smart contracts: Verus, Alephium, Ravencoin, Nano, Iron Fish, Ergo, Symbol, Ontology, Peercoin, Flow, Koinos, Ycash, Steem, Counterparty, Rootstock, Hedera, Vertcoin, MultiversX, Casper, Hive, Elastos, Ardor.
Cosmos / IBC: Sei, Agoric, Celestia, Osmosis, Akash, Juno, Kava, Dymension, Namada.
Other / sidechains: Elements/Liquid, Stacks, VeChain, Astar, Kaspa, Decred, CKB, Handshake, Secret, Hathor, Fuel, Radix, Penumbra, Aleo, Aleph Zero, Kadena, Nimiq, Waves, Massa, dYdX.
Prototypes / no mainnet: Anoma (v1.0.0 prototype, must not be described as a mainnet vulnerability).
Unaudited / not included: Banano, Aeternity (no liquidity, already excluded); Ardor (different source entry point), Elastos (the GitHub repository is not the consensus source) and similar are handled according to the report's boundary.

Audit library

A report to discuss, a conclusion to verify?