They are likely to be just normal noodles with extra egg marketed as high protein. Suspect they are still wheat based, nutritional info should tell you carbs per 100g.
If ingredients read wheat in the first couple it's likely to be very high carb for keto
Taste and test. Have you tried zoodles, spiralized courgettes?
If they are Oomi noodles they are made from fish protein and are low carb at 6.1g per 100g. I have them quite often as a substitute for wheat noodles and they don't raise my BG.
Regarding the texture of Oomi noodles: If I am having them in a sauce or soup I microwave them like it says on the packet as the gloopyness doesn't notice but with something dry I fry them with garlic and chilli to dry them out a bit.There are some in Lidl that members here eating very low carb eat. Best way is to test and see. I tried oomi noodles once a couple of years or so ago - not for me, didn’t enjoy the texture but they didn’t raise my BG significantly.
I have tried the konjac noodles (can't remember the brand name, but available in Tesco) and they're almost zero carb. They have an odd texture but are ok when fried with vegetables in a stir fry. They add a nice bit of bulk without the calories or carbs.
I have also been eating the black bean spaghetti from Aldi which is less than 3g carb per 100g and I have found it to be a good substitute for both noodles and spaghetti. Tastes good, good texture and doesn't spike my BG.
The carb content probably rules these out for keto dieters.Morrisons protein noodles are made with pea protein and are about 23carbs per 100g and are very tasty.