No. WhatsApp does not send a notification. However, they might infer it if:
If someone deleted their WhatsApp account entirely, they will disappear from your blocked list automatically. There’s nothing to unblock. how to unblock someone on whatsapp
WhatsApp Web and the desktop app (Windows/Mac) mirror your phone, so the steps are similar but optimized for a mouse and keyboard. There’s nothing to unblock
If you deleted the chat while they were blocked, there’s no official way to recover it unless you have a or iCloud backup from before you deleted it. Restoring that backup will also restore other chats to that point in time – which may not be ideal. Restoring that backup will also restore other chats
Check if you also blocked them on your phone’s native SMS/call block list. Also, make sure you have a stable internet connection. If all else fails, ask them to delete your number from their phone and re-add it (rare contact sync glitches happen).
Open WhatsApp and tap the (Menu) in the top right corner. Select Settings > Privacy . Scroll down and tap Blocked contacts .
Alternatively, tap in the top right, then the red minus sign next to the name. From the Chat: Open the chat with the blocked contact. Tap the contact's name at the top to open Contact Info . Scroll to the bottom and tap Unblock Contact . How to Unblock Someone on WhatsApp Web/Desktop