Self-reported is fine, and for at least one entry you would not have to trust the report at all.
GODELEV/Rose-Mini ships training_meta.json next to the weights, with tokens_seen: 12206861568 and params_M: 49.443. Machine readable, already public. A leaderboard that reads that file gets a verified number for free, and falls back to the form field only when the file is missing. Once the column exists to reward it, one small JSON is a cheap ask of a submitter.
On the comparison, the card argues the other way. Rose X1 is described there as an efficient decoder-only design with GQA, RMSNorm, QK-norm and refresh gates, and the author's own line is that the goal was never to reinvent the Transformer, only to explore it. config.json backs that up: 14 layers, 8 heads, 2 KV heads, RoPE at theta 1e5, and refresh_gate_inject_layers [4, 9]. Two injection points in an otherwise standard decoder stack is exactly what a shared benchmark exists to price.
Pulling it out also costs Rose-Mini its best result. 49.4M parameters at 12.2B tokens landing in BananaMind 2 Medium's range only reads as a finding from inside your table.
Would you rather scrape tokens_seen from the repo, or take it on the submission form?