The final result for the above is that, for both treated and untreated seeds, the 16 out of 17 seeds germinated. The only effect demonstrated was earlier germination and a decrease in the variance of time to germination for the chloroform treated seeds.
NEW EXPERIMENT:
On 3/14/21, I treated 21 year old tomato 'Better Boy' seeds and 13 year old tomato 'Giant Tree' seeds, as before, but planted 25 seeds of a kind in the same containers. These seeds were aged in my basement instead of a refrigerator. In the following photos, the top left container is untreated Giant Tree, top right is treated Giant Tree, bottom left is untreated Better Boy, bottom right is treated Better Boy.
3/28/21:
So far, only 5 treated Giant Tree seeds have germinated.