No. WWG isn't wrong on his release dates, because he hates to give release dates in general. The only times he gives a date is when it's about to come out and he is confident he'll make the date. Kinda how all devs are starting to become. If you've been in this site long enough, you'll see how they go after dev's throats for missing their release date.
There is no "notoriously bad at hitting timelines", because WWG has never once announced his plans for his next update out, after releasing an update.
We know it's releasing in march, because he announced it in march. that's how safe he likes to play it.