Sadly it appears to be true, because the FAA considers a safety pilot to be acting as SIC while the PF is under the hood (as the flight then requires two crewmembers during that time). They rewrote the rule that applies to SIC qualifications to require an instrument rating if the flight is conducted under IFR.
The reference is 61.55 (a) (2).
Well if that's the case there's a lot more to being qualified to act as a safety pilot. 61.55b contains the same language as a WRT operations requiring a SIC. Now I'm wondering if 61.55 (f) eliminates all the specified requirements of 61.55 (b)? It speaks to "familiarization training requirements" of part b without any further hints as to whether that applies to all of (b) yet if that's what meant it could have simply read "paragraph b of this section does not apply..." or paragraph (b) could have contained "except when acting as a safety pilot for purposes required by 91.109" and since neither of those is the case it would seem that perhaps only sub paragraph 2 is excluded. It never ceases to amaze me how poorly written many of the FARs are.
(b) Except as provided in paragraph (e) of this section, no person may serve as a second-in-command of an aircraft type certificated for more than one required pilot flight crewmember
or in operations requiring a second-in-command unless that person has within the previous 12 calendar months:
(1) Become familiar with the following information for the specific type aircraft for which second-in-command privileges are requested—
(i) Operational procedures applicable to the powerplant, equipment, and systems.
(ii) Performance specifications and limitations.
(iii) Normal, abnormal, and emergency operating procedures.
(iv) Flight manual.
(v) Placards and markings.
(2) Except as provided in paragraph (g) of this section, performed and logged pilot time in the type of aircraft or in a flight simulator that represents the type of aircraft for which second-in-command privileges are requested, which includes—
(i) Three takeoffs and three landings to a full stop as the sole manipulator of the flight controls;
(ii) Engine-out procedures and maneuvering with an engine out while executing the duties of pilot in command; and
(iii) Crew resource management training.
(f) The familiarization training requirements of paragraph (b) of this section do not apply to a person who is:
(4) Designated as a safety pilot for purposes required by §91.109 of this chapter.