He meant that Exolent is using too much spacing in his code. While I also don't see how such spacing can look good or improve readability for anyone, it's a matter of one's taste.
Also it would be more efficient to not use 2D arrays for such code. Here's my way tho:
Code:
new message[sizeof(g_szWelcomeMsgs[])];
copy(message, charsmax(message), g_szWelcomeMsgs[g_RandomMsg]);
RemoveAll(message, charsmax(message), "\r");
RemoveAll(message, charsmax(message), "\y");
RemoveAll(message, charsmax(message), "\w");
RemoveAll(message, charsmax(message), "\d");
RemoveAll(message, charsmax(message), "\R");
client_print(id, print_chat, "bibu said %s to all", message);
// ...
RemoveAll(message[], length, text[])
while (replace(message, length, text, "")) {}