Updated from Slack docs, 2025/09/11

Author: Slack API Ref Buildbot

docs.slack.dev/methods/chat.delete.json

@@ -20,7 +20,7 @@
         "example": "xxxx-xxxxxxxxx-xxxx"
       },
       "as_user": {
-        "desc": "Pass true to delete the message as the authed user with `chat:write:user` scope. Bot users in this context are considered authed users. If unused or false, the message will be deleted with `chat:write:bot` scope.",
+        "desc": "(Legacy) Pass true to delete the message as the authed user with `chat:write:user` scope. Bot users in this context are considered authed users. See [legacy `as_user` parameter](#legacy_as_user) below.",
         "example": "true",
         "type": "boolean"
       },

methods/chat/chat.delete.json

@@ -7,7 +7,7 @@
     "as_user": {
       "required": false,
       "example": "true",
-      "desc": "Pass true to delete the message as the authed user with chat:write:user scope. Bot users in this context are considered authed users. If unused or false, the message will be deleted with chat:write:bot scope.",
+      "desc": "(Legacy) Pass true to delete the message as the authed user with chat:write:user scope. Bot users in this context are considered authed users. See legacy as_user parameter below.",
       "type": "boolean"
     },
     "channel": {