Yes, that's what the Safety Standard for products containing button batteries says. In particular, Part 2, Division 2 says:
Hot Toys collectors are concerned because the battery compartments on those figures aren't compliant - it seems that the particular issue is that the screws may not be captive.8 Button/coin batteries must not release during reasonably foreseeable use or misuse conditions
(1) If consumer goods contain a button/coin battery (whether or not the battery is intended to be replaceable), the battery in the consumer goods must not release during reasonably foreseeable use or misuse conditions.
9 Compartment holding button/coin batteries must be resistant to being opened by young children
(1) If consumer goods contain a button/coin battery that is intended to be replaceable by a consumer, the compartment in which the battery is held must be designed to ensure the compartment is resistant to being opened by young children.
10 Fasteners for doors or covers to compartments holding button/coin batteries must be captive etc.
(1) This section applies to consumer goods containing a button/coin battery if:
(a) the battery is held in a compartment in the consumer goods; and
(b) the door or cover providing access to the compartment is secured by screws or similar fasteners; and
(2) The consumer goods must be designed to ensure the screws or similar fasteners used to secure the door or cover providing access to the compartment are captive and remain with the door or cover.
I just took a look at my MP-44, which would be representative of the kind of button cell-powered product us collectors would be buying, and its battery compartment is secured with a screw that also has a little plastic washer around the thread that's inside the battery cover, so I guess that's captive?
Also, the Information Standard requires that products that use button cells have visible warnings on the instructions and the front of the packaging:
I suppose an importer could put a sticker on the box for something like a Masterpiece and hopefully that would suffice.8 Consumer goods with button/coin batteries—general requirement for warning
(1) This section applies in relation to consumer goods containing a button/coin battery unless section 9 applies to the consumer goods.
Consumer goods with accompanying instructions
(2) If the consumer goods are accompanied by instructions, the instructions must include a warning about the battery that is clearly visible, prominent and legible and includes the substance of all the matters covered by subsection (7).
Packaged consumer goods
(3) If the consumer goods are packaged, the front panel of the packaging must be marked with an internationally recognised safety alert symbol that is clearly visible, prominent and legible.
(4) If the consumer goods are packaged and are not accompanied by instructions, a warning about the battery that includes the substance of all the matters covered by subsection (7) must be attached to, or included with, the consumer goods.
Unpackaged consumer goods
(5) If the consumer goods are not packaged, a warning about the battery must be attached to the consumer goods that includes the substance of all the matters covered by subsection (7).
(6) For the purposes of subsections (4) and (5), a warning may be attached by:
(a) affixing a sticker with the warning to the goods; or
(b) attaching a tag with the warning to the goods.