Buildbot repositories down?

#/etc/apt/sources.list
# deb cdrom:[Debian GNU/Linux 9.8.0 _Stretch_ - Official i386 xfce-CD Binary-1 20190216-12:51]/ stretch main 
# deb cdrom:[Debian GNU/Linux 9.8.0 _Stretch_ - Official i386 xfce-CD Binary-1 20190216-12:51]/ stretch main 

deb http://deb.debian.org/debian/ stretch main contrib non-free 
deb-src http://deb.debian.org/debian/ stretch main contrib non-free 

deb http://security.debian.org/debian-security/ stretch/updates main 
deb-src http://security.debian.org/debian-security/ stretch/updates main 

# stretch-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ stretch-updates main 
deb-src http://deb.debian.org/debian/ stretch-updates main 

deb http://buildbot.linuxcnc.org/ stretch 2.8-rtpreempt  
deb-src http://buildbot.linuxcnc.org/ stretch 2.8-rtpreempt 

# Key previously placed on keyring
root@debian-9:~# gpg --keyserver hkp://keys.gnupg.net --recv-keys EF1B07FEE0EE663E
gpg: key EF1B07FEE0EE663E: "LinuxCNC Buildbot <nomail@linuxcnc.org>" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1
root@debian-9:~# 

root@debian-9:~# apt-get update
Get:1 http://security.debian.org/debian-security stretch/updates InRelease [53.0 kB]
Ign:2 http://deb.debian.org/debian stretch InRelease                                       
Hit:3 http://deb.debian.org/debian stretch-updates InRelease                               
Hit:4 http://deb.debian.org/debian stretch Release                         
Get:5 http://buildbot.linuxcnc.org stretch InRelease [28.0 kB]     
Get:6 http://security.debian.org/debian-security stretch/updates/main Sources [277 kB]
Ign:5 http://buildbot.linuxcnc.org stretch InRelease  
Fetched 358 kB in 3s (116 kB/s)
Reading package lists... Done
W: GPG error: http://buildbot.linuxcnc.org stretch InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EF1B07FEE0EE663E
W: The repository 'http://buildbot.linuxcnc.org stretch InRelease' is not signed.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

#
root@debian-9:~# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

#
root@debian-9:~# uname -a
Linux debian-9 4.9.0-14-rt-686-pae #1 SMP PREEMPT RT Debian 4.9.240-2 (2020-10-30) i686 GNU/Linux
root@debian-9:~# 

su root
rootPW
adduser userName sudo
# Install the sudo executable
apt install sudo
su userName
# Now sudo works but breaks Thunar's ability to view exfat USB drives

# Correct the issue with exfat USB drives
sudo apt-get install exfat-fuse exfat-utils

# Install key for buildbot
sudo apt-key adv --keyserver hkp://keys.gnupg.net --recv-key EF1B07FEE0EE663E

# Add the following to for the Synaptic Package Manager
echo deb http://buildbot.linux.org/ stretch 2.8-rtpreempt >>/etc/apt/sources.list  
echo deb-src http://buildbot.linux.org/ stretch 2.8-rtpreempt >>/etc/apt/sources.list
# You should now be able to download the 2.8 version of LinuxCNC without errors