I would say it should really be don't use GWT? Blaming entire java for a framework that is developed originally at Google doesn't seem right to me (particularly when Google Employee does that).
I didn't notice a mention of GWT (not that it wasn't in there) and I would agree if thats the case, Java is very strong for server-side development but GWT definitely can be bloated and it isn't really Java anyways, you write it in Java but it runs as JavaScript so I'm sure it loses most advantages that it would have if it really were running as Java
I would say it should really be don't use GWT? Blaming entire java for a framework that is developed originally at Google doesn't seem right to me (particularly when Google Employee does that).