Please Baganing, i know what a punal is and i know that they are meant to be knife length. Truly antique punals will undoubtable always be a knife length. In the 20th century however, punals got larger and larger, mostly for tourist consumption. The punals in the photo you linked to are all modern pieces. These types are also shown in the link i just posted. I really don't need to find a Maranao to confirm this for me.
All true kris and keris have an asymmetric blade, with a section at the base known as the gangya (the spelling i usually see applied to Moro Kris) or gonjo (Indonesian). It is clear from the sheath style in the picture you linked to that these blades do not have this asymmetrical feature. Therefore they are not kris, but instead long punals or gugongs if you prefer,
No, you are not bragging about your background. In fact, i know very little about it and have no reason to take your word on anything based on what i know about you.
