Vastauksen tähän kysymykseen jakoi irritus
You could try adding additional port mappings on Huawei's virtual servers lists to check this out. For example WAN port 8000 to LAN IP 192.168.100.10 LAN port 82 and/or WAN port 8080 to LAN IP 192.168.100.10 LAN port 82.
Then try downforeveryoneorjustme.com again using all the ports you have configured.
BTW, have you confirmed that your WAN IP address as shown on Huawei's web interface is really public? Be aware that besides traditional 10., 172.16. to 172.31. and 192.168. private address ranges, 100.64. to 100.127. is used for carrier grade NAT.
Getting a public ip address with Elisa / Saunalahti mobile data requires both that you subscribe to the service and you have configured your router to use access point name (APN) internet4.