Because in August 2010, Minecraft: Pocket Edition did not exist. That would not launch for another year (August 16, 2011). Alpha 1.0.16_02 is pure Java code (LWJGL), not Dalvik/ART code (Android).
If you want to experience Alpha 1.0.16_02 or play Minecraft on Android, here is the legitimate way to do it: minecraft java alpha 10 1602 download apk full
Mojang allows playing old Alpha versions through the official launcher: Because in August 2010, Minecraft: Pocket Edition did
by going to "Installations," checking the "Historical" box, and creating a new installation with the version named old_alpha a1.0.16 Alternate Options Omniarchive Because in August 2010
If you want the authentic retro experience: