I don't think it says that.
Here is a link to Friend at Court
2010, (about page 244) and a relevant cut and paste is below.
2. Only physically able players shall be listed in the line-up. Coaches shall
list players in the line-up only if they are able to play.
3. Players must play in order of ability. The line-up shall always be based
on order of ability. “Matching up” is prohibited. In singles, players must
compete in order of ability with the best player on the team playing at
the No. 1 position, the second best at No. 2, and so on through all
positions. In case of injury or sickness, all players must move up. This
rule shall also apply to doubles play with the strongest doubles team at
No. 1, etc.
a. A player who has established a winning record at a team position
in six team matches and whose results show that he clearly is
stronger than the players below him may not be moved down. The
line-up must stay in order of ability.
b. If a top-six player (or team) clearly is stronger than the player
immediately above him, then the player must be moved up a
c. Players of equal ability and equal record may alternate between
two adjacent positions so long as the alternating is not done for
the purpose of “matching up.”
d. A player shall not be moved down in the line-up because of:
i. An injury that has lasted and forced the player out of the
lineup for less than three weeks;
INTERCOLLEGIATE TENNIS ASSOCIATION (ITA) REGULATIONS 263
264 INTERCOLLEGIATE TENNIS ASSOCIATION (ITA) REGULATIONS
ii. Disciplinary measures; or
iii. Challenge matches after six team matches have been played
after January 1st of a school year.
4. Line-up changes in back-to-back dual matches. In back-to-back dual
meet matches (two consecutive dual meet matches played regardless of
time between matches), the team line-up (as played) may be changed. A
player may move up or down one position in this situation. The line-up
must still stay in order of ability.
5. Line-up changes once a match has begun .....