This isn't strange or abnormal in normal business, it is just newer for tech staff. I have seen this a lot in marketing and executive employment agreements. It is basically so companies don't get sued for showing pictures of you on their website or in their marketing info etc. Generally it is for two things, 1 to be able to use your image, and 2 to say you have already been compensated for any use of your likeness.
Honestly, I think you should be glad this company is being up front about it and not doing what most startups do which is use all that without ever asking your permission or telling you what they might use.
If later something changes for you personally, you can send a cease and desist letter to prevent them from using your likeness in the future. IANAL but you do have rights to control the usage of your likeness and bio for future use, you couldn't stop prior usages or force them to recall marketing brochures, but you could prevent them from using your likeness on future material (digital or print) if you sent the C&D.