Most vaccines, including Co-vid19, are given into the layer of fat just below the skin (subcutaneously). While you certainly have blood vessels in that fatty layer, they are primarily capillaries. Even if the capillaries develop a clot, the clots don't go anywhere. Just like if you get a clot from an intravenous (IV), it is in a peripheral vein, and they almost never move. I've had one, and they are miserable, but not very dangerous. The clots you have to worry about are in the deep veins or arteries in the body. Those blood vessels are big enough that you have a real danger of them moving somewhere you don't want them to be.
I watch his videos periodically as he looks at things differently than other people, and he measures as usually/mostly credible on my "bovine fertilizer" meter. Almost no one measures as absolutely credible. I cross reference/look for other opinions on everything, so don't take that as a criticism on him specifically. What bothers me the most on this particular video are the following in no particular order:
Your liver is on the right, your spleen on the left.
The Co-vid vaccines available in the US are mRNA, not adenovirus.
The vaccine is given into the subcutaneous layer, not the deltoid muscle. Big difference. Anyone who is giving this vaccine properly will not be giving it into the deltoid muscle. Muscles have larger blood vessels than the subcutaneous layer. There is a much higher risk of causing a blood clot when giving injections into the muscle, and aspiration is still considered best practice when giving an intramuscular injection.
I am wondering when this video was made, because lots of what he is talking about is not true of what we are seeing from current vaccines. It seems to be dated info. I tried to check when it was made, but I am currently distracted by multiple news feeds on Hurricane Ida.