ii dont agree.
i believe it's fine to bring up an old post.. but so long as you do not reply to that post as if it was an active on going thread.
for example you may want to add in a suggestion not posted before to comment on the original author's works etc.. there really is no point in starting a new thread to do this simple task.. replying is fine, don't you think?
what i do believe is that the grammar and sentence structure should be given consideration.. as it is it is a post of the past. so using past tense in references or quotes would be a good idea. another thing is it would be pointless and useless to criticize/comment the original author on his works.. but this dosen't mean you can't criticize/comment his works. there's a difference and it is NOT subtle.
another thing, dont reply to converstions within that post that have headed in a tanget to the actual topic of post. that is redundant and foolish