It’s very likely they all add svg generation into the training data. It’s part of the reason it’s no longer a good benchmark (unless you need to generate SVGs).

It's about more than just training data. Every model since GPT-2 had SVGs in the training data, because they all used a scrape of the Web and the Web is full of SVGs. What's unique about Gemini is that they actively worked to get better results for their SVGs - maybe RLHF, maybe RLVF of some sort.