grub.cfg is not generate properly?

Ubuntu 20.04.2.0 (latest as of 2021-04-22)

The default installation of Ubuntu has GRUB_TIMEOUT_STYLE=hidden

But the grub.cfg (after update-grub) has

Quote:

terminal_output gfxterm if [ "${recordfail}" = 1 ] ; then set timeout=30 else if [ x$feature_timeout_style = xy ] ; then set timeout_style=hidden set timeout=10 # Fallback hidden-timeout code in case the timeout_style feature is # unavailable. elif sleep --interruptible 10 ; then set timeout=0 fi fi

How to interprete this?

Worse still, near the end of grub.cfg,

There is a strange

Quote:

set timeout_style=menu if [ "${timeout}" = 0 ]; then set timeout=10 fi ### END /etc/grub.d/30_os-prober ###