Language has always changed. Linguists tried to get rid of some antiquated
spellings and rules as well as some inconsistencies in the old rules.
Some people don't like change and would like to freeze things forever at the
status quo. And once populist politicians got involved, the discussion
degraded real fast.
The whole overblown discussion over some pretty minor changes was a good
example for how even the most sensible reforms are doomed to failure in
Germany right now.
As you can see, it's a controversial subject ;-)
If "delphin" is marked wrong, then it is the old spelling.
No, if "Delfin" is marked wrong.
The spelling reform in many, if not most, cases now "allows" both the old
and the new spelling... which means the Word spell checker won't do much
good if you want consistent spelling.
Regards,
Klaus