https://twitter.com/spriggan_anime/status/1539609198321074177
Spriggan's in the Top 10 anime shows streamed in Japan as of today.
You'll have to explain which dated part you're talking about.
Meanwhile, I'll have to do a dive on Kenichi Kaneko's twitter. He assisted the staff in animating the small arms used in the ONA.
https://www.animenewsnetwork.com/bbs/phpBB2/viewtopic.php?p=5342036&highlight=#5342036
This is one post that someone has, sharing his dislike on the having the Holy Grail Arc where Hitler's involved (and being a good guy)...
https://natalie.mu/comic/news/525232
If anyone's in Tokyo, Toho Cinema's having an event in June in one of their cinemas in Hibiya. The main seiyus for Yu, Jean and Yoshino will appear for an event.
Spriggan will also air in Japan via Tokyo MX and other stations.

The Spriggan manga is coming again with a full adaptation courtesy of Netflix and David Productions.
It previously had a OVA in 1998.
The final trailers were also released.
Japanese
English
PS: I've been able to get the Chuang Yi volumes from the original publication. Not sure if Seven Seas will include the bonus chapters.
Edited by Ominae on May 27th 2022 at 6:14:42 AM