You refer to Example 3 on page 11 of LFT 13. The squad in J4 does not have LOS to H3. One should read the EX as if the road went through I4 instead of I3.
There a couple of other errors in the EX. The German tank moves up and uses BFF over the roadblock with, presumably, its CMG (its BMG being blocked by the roadblock). Range is two so the FP should be halved for BFF with no doubling for range. The PzIII D shown does not have a CMG with five FP, but rather eight FP so if the road went through I4 and there was LOS from I4 to H3, the attack would be four FP not five FP. After having fired, the tank fires its sD ("SD" in the article) which is not allowed after using BFF [D13.2]. Assuming there was a LOS from I4 to H3, the squad should have fired its LMG as TH/TK at the tank when it stopped, putting down the firelane. The tank has zero frontal turret armor and could easily be dropped by a LMG shot. The engineering party trying to clear the roadblock would then be attacked at one FP flat (+2 roadblock, -2 hazardous movement) even if the tank fired its sD instead of (or at least before) BFF . The squad could also attack (at four FP add two if the tank fired its sD or at two FP flat if the tank fired its CMG and got a Pin result).
JR