Hello @Dave2522 ,
Suspended bounces are based on contacts have bounced as non-existent enough for our system to determine they're not valid emails that can be sent to. Contacts being out of office due to COVID would likely either just not respond to the emails, or they'd be showing up as auto-reply / mailbox full bounces.
For more general info on bounces
For more info on managing and removing bounces
If an email address you know if genuine is bouncing as suspended, I'd recommend speaking with our Deliverability team to see if they can offer any specialized insight.