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I am not sure what it means when they talk about an ITTF "rule" compared to a "regulation"

Check ITTF Handbook 2022

Rules seem to be Sections 2 & 5
Regulations seem to be Section 3,4, 6,7,8,9,10

From what I understand the important fact is that a rule change requires 75% of votes by the 226 or so National affiliates of ITTF
A regulation change requires only a simple majority or 51% of the votes of ITTF exectutive council

From the ITTF Handbook
1.5.11 Changes to Rules
1.5.11.1 Rule change propositions and resolutions may be submitted to:
1.5.11.1.1 the AGM or the Board by Associations, the Executive Committee,
Continental Federations, Committees, Commissions, the ITTF Integrity
Unit and the ITTF Tribunal; and
1.5.11.1.2 to the AGM by the Board.
1.5.11.2 Rule change propositions to be considered at an AGM, EGM or a Board
meeting must reach the ITTF not later than 3 months before the date of
the meeting.
1.5.11.3 Amendments to the Constitution and the Laws of Table Tennis shall be
made only at an AGM or EGM; amendments to other Regulations shall be
made only at a meeting of the Board, with the exception of amendments
to the Anti-Doping Rules, that can be made also by the Executive
Committee, if necessary, to maintain WADA compliance.
1.5.11.4 Details of all rule change propositions shall be published in the agenda of
the meeting at which they are to be considered.
1.5.11.5 The implementation date of each change shall be specified; if there is no
such specification, the change shall take effect from 1st January of the
following year once a decision is taken. Anti-doping rules may have a
different implementation date if it is requested by WADA and/or approved
by the Executive Committee.