Closed holes & handicapping | Golf Monthly

I would post the lot form the appropriate rule but easy to read for yourself

From the Rule Book
The additional scores are penalty scores

7.1b Applying a Penalty Score
In a situation where a player fails to submit a score from an authorized format of
play in a timely manner, the Handicap Committee should investigate the reason
and take appropriate action.
(i) If There is a Valid Reason For a Score Not Having Been Submitted. The
Handicap Committee of the player’s home club has the authority to
determine whether a player’s reason for not submitting a score is a valid
reason.

............

l Invalid reasons for not submitting a score can include:
o Preventing a low score from causing a Handicap Index to decrease.
o Preventing a high score from causing a Handicap Index to increase.