Hololive has released a statement with updated info about Mio's health (EN translation inside)

Original statement: Xitter

Using OCR and DeepL (though there's still some garbled stuff from the OCR, and incorrect stuff from the translation that I didn't immediately know how to fix so have left as-is):

Ookami Mio's Medical Condition and Future Performances

We are writing to inform you that Ookami Mio, a member of Hololive Productions 1, Inc,
We are writing to inform you that Ookami Mio, a member of Hololive Production 1, has been found to have a medical condition requiring long-term treatment.

[She] was hospitalized on April 28th (ョ) due to an emergency medical condition.
The name of [her] illness is being withheld to protect [her] privacy, and we apologize for the delay in reporting [her] condition.
[Her] condition is on the way to recovery, but the company has decided to cancel [her] participation in the “hH” show, which [she] is scheduled to appear in.
We have decided to cancel our scheduled appearances at the “hololive GAMERS fes.
We will not be performing at “hololive GAMERS fes. super super super gamers
DEPRESSION DECLINED [tl note: lol @ translation]
We will not be performing at “MUSIC VERSE Fes.
Please check the announcement from Ipento official x for more details.

We sincerely apologize for any inconvenience this may cause to our fans.
We look forward to your continued support and patronage.

Monday, May 13, 2024
[Cover] Corporation