No, the issue is not yet fixed and rolled out with 20.04 updates.
It means that the issue is handled for focal/20.04 by the LP bug 1900624 and 
that is just Fix Committed (and not yet Fix Released).
The status and plan is (as of today) that the commit 709192d531e5 ("s390/dasd: 
Fix zero write for FBA devices") landed in Ubuntu's focal master-next git tree.
And according to 'kernel.ubuntu.com' an new binary kernel will be build and 
made available for testing in '-proposed' around 13-Nov. And if the "Bug 
verification & Regression testing" doesn't show any problems, this kernel will 
then be released to '-updates' around 30-Nov.

All kernel updates are usually processed by 3-weekly 'kernel SRU' cycles that 
are posted here: https://kernel.ubuntu.com/
But due to internal rearrangements and changes one SRU cycle is skipped this 
time ("There will be no SRU cycle from October 12 through November 8.").
 
But the fix is already included in Ubuntu 20.10, which was released just 
yesterday!

To shorten the time a bit until it get's released for focal/20.04, I
just compile a kernel based on the current master-next (that should have
the fix in) and made it available for testing here:
https://people.canonical.com/~fheimes/lp1867118/

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https://bugs.launchpad.net/bugs/1867118

Title:
  dasd_fba io error and kernel panic

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