Alchemy.Cache.load_guild_members

You're seeing just the function load_guild_members, go back to Alchemy.Cache module for more information.
Link to this function

load_guild_members(guild_id, username \\ "", limit \\ 0)

Requests the loading of offline guild members for a guild.

Guilds should automatically get 250 offline members after the :ready event, however, you can use this method to request a fuller list if needed.

The username is used to only select members whose username starts with a certain string; "" won't do any filtering. The limit specifies the amount of members to get; 0 for unlimited.

There's a ratelimit of ~100 requests per shard per minute on this function, so be wary of the fact that this might block a process.