Is this type of scope probe homemade?
This is not a "probe", this is called "ground accessory" to some old active probes like Tektronix P5100 etc. The shown is a hand-made accessory, but there were ground tips made of springy wire and officially sold by oscilloscope companies. An example of a smaller size ground contact,



or for Agilent probes (circled in red:



The purpose of these short probe leads  is to decrease inductance of leads (ground in particular) and gain few dozens of MHz to overall probe's bandwidth. And to reduce unwanted parasitic interference from nearby signals. Here is the detail: