I don't think there are evaluating the market share of the hole market as important. Panasonic isn't competing in every camera category. There are people only evaluating more specific market shares, like market share in full frame cameras between 1000-3000 $, because the S5II, S5IIX and S9 compete in this category. And they have probably also a category for the G9II and GH7 in which they compete and evaluate the market share in that category.
Canon for example has by far the biggest market share, but most of it comes from the APS-C camera's like beyond 1k USD (R100, R10, R50, etc) and because there are still selling DSLRs and compact cameras. At most time of 2024, Panasonic had only one model beyond 1k and no DSLR and every Compact camera where discontinued. In 2024 DSLRs still made about 12 % of the market and fixed lens cameras made about 22 % of the market (all according Cipa numbers). Also they didn't complete in high end cameras for above 3k, but I don't know how big that segment is. But all in all Panasonic didn't actually complete in over 1/3 of the market in 2024. So it doesn't make sense for them to evaluate there share for the hole market. Actually the only manufacturer who was competing in every category is Canon and that's also the reason they are no. 1, by far. Sony and Fuji didn't make DSLRs, Nikon didn't make compact cameras, Panasonic and OM didn't make DSLRs and compact cameras (Panasonic for most of 2024) and Ricoh didn't make mirrorless cameras.
However Panasonic started making compact cameras again in 2024 and released the TZ99 (available only since early 2025). Panasonic's market share (only data for Japan) jumpy from zero to almost 15 % because of the TZ99. So don't be surprised Panasonic's market share will rise for 2025. But it's not only due to the S1II series, also the TZ99 will have an impact.