How to disable CTRL-ALT-DEL reboot

sudo systemctl stop
sudo systemctl disable
sudo systemctl mask

I have done it. But when I hold on pressing ctrl+alt and press the del button for 10 times
Continuously, it will also reboot.
Jp4.6.3 tx2nx

Here is the log when it reboot

watchdog:watchdog0:watchdog did not stop!
systemd-shutdow: 62 output lines suppredded due to ratelimiting
systemd-journald[2181]: Failed to send stream file descriptor to service manager:connection refuse