Yes, the Sony A7 IV is compatible with the Sony SF-G Tough 128GB.
The sony sf g tough 128gb is an SDXC UHS-II V90 card. V90 meets the A7 IV's most demanding SD requirement (XAVC S-I 4K 600Mbps needs V90), so it records every SD mode the body offers.
“XAVC S-I 4K 600Mbps CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher”
“Class 3 (UHS Speed Class), V90 (Video Speed Class)”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)